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Pi Dice$2.50
Each face of these dice features the first eight digits of pi arranged in a circle around the pi symbol. Each of the numbers 1-6 is contained in the first eight digits of pi, and one of them is enlarged on each face, allowing the dice to be used like regular d6 dice. Single die, in red, blue, or green; color choice can be specified on the shopping cart page. Laser etched and hand inked. |
Skew Die$3.00
Single Skew Die, a d6 in the form of an asymmetric trigonal trapezohedron. These wacky-looking dice are actually just as fair as regular six-sided dice. Unlike other dice, Skew Dice ^{TM} aren't mirror symmetric. This means they come in two distinct forms that are mirror images of one another. Available in white, black, blue, green and red. |
Skew Dice Pair$5.95
Packaged pair of Skew Dice, d6 in the form of an asymmetric trigonal trapezohedron. These wacky-looking dice are actually just as fair as regular six-sided dice. Unlike other dice, Skew Dice ^{TM} aren't mirror symmetric. This means they come in two distinct forms that are mirror images of one another. Available in white, black, blue, green and red. |

Skew Dice Statistics$24.95
Packaged set of ten Skew Dice and ten standard dot dice: $29.95 This set is geared at learning statistics at the high-school level. Three Classroom Activities are available for free download. Designed to address specific CCSSM, the activities cover the gathering and plotting of data; the mean, median, interquartile range, variance, and standard deviation; and using the normal distribution to analyze data. Grades 8-12. |
OptiDice d6$2.50
Single d6 die optimized for fairness by using numerals that are physically balanced, and sizing the dice based on both manufacturing and game play considerations. With a face-to-face diameter of 18 mm, these d6s are significantly larger than most d6s on the market. Available in black, white, red, blue, and green. You can specify your color choice in the shopping cart. |
1-10 Board Game Die$2.50
Give old board games a new twist! In games like Monopoly, two standard d6 are rolled, with results ranging from 2-12. The distribution is peaked in the middle, so 7 is the most likely result, and 2 and 12 are the least likely result. This specially-numbered die, when rolled along with a standard d6, will yield a middle-peaked distribution ranging from 1-10 (which we think makes more sense than 2-12!). For more details on the distributions, click "here." Laser-etched and hand inked, only available in red. |

1-13 Board Game Die$2.50
Give old board games a new twist! In games like Monopoly, two standard d6 are rolled, with results ranging from 2-12. The distribution is peaked in the middle, so 7 is the most likely result, and 2 and 12 are the least likely result. This specially-numbered die, when rolled along with a standard d6, will yield a middle-peaked distribution ranging from 1-13. Extending the possible ranges of rolls by one in each direction will punch up your favorite game. For more details on the distributions, click "here." Laser-etched and hand inked, only available in blue. |
Permutation d6$2.50
There are six different ways of permuting or ordering three objects A, B, and C: ABC, ACB, BAC, BCA, CAB, and CBA. This d6 allows you to randomly choose a permutation for three objects. Laser etched and hand inked. |
Spherical Die$3.00
Spherical die with dot numbering 1-6. We normally stock white, blue, red, and black. You can specify your color choice in the Shopping Cart. |

Hexahedral Double Die$1.00
A six-sided die within a larger and transparent 6-sided die! Only available in color shown. |
"Crystal" d6$1.50
Uniquely-shaped "crystal" d6. We normally stock the "Oblivion" color, black with swirls of color and gold numbers. Your preferred color for the swirls can be stated in the Shopping Cart, and we'll match your request if possible. |
Three Dice in a Cube$1.00
Three small six-sided dice within a transparent cube! Only available in color shown. |

Fractal d6 - Ivory$3.00
On this six-sided die, the numbers one to six are indicated by one to six images of dice with one to six spots. The design is fractal, but only carried through one iteration. The number of spots on each face is the square of the number of dice on each face. Single die, ivory-colored laser-etched plastic. |
Fractal d6 - RGB$2.50
On this six-sided die, the numbers one to six are indicated by one to six images of dice with one to six spots. The design is fractal, but only carried through one iteration. The number of spots on each face is the square of the number of dice on each face. Single die, in red, blue, or green; color choice can be specified on the shopping cart page. Laser etched and hand inked. |
Rings of Rings d6$3.00
On this six-sided die, one to six linked rings are arranged in rings. The group of three rings is the famous Borromean Rings configuration. Single die, ivory-colored laser-etched plastic. |

Rings of Rings d6 RGB$2.50
On this six-sided die, one to six linked rings are arranged in rings. The group of three rings is the famous Borromean Rings configuration. Single die, in red, blue, or green; color choice can be specified on the shopping cart page. Laser etched and hand inked. |
Linked Rings d6$3.00
Linked rings are used on this six-sided die to represent the standard dots. Single die, ivory-colored laser-etched plastic. |
Linked Rings d6 - RGB$2.50
Linked rings are used on this six-sided die to represent the standard dots. Single die, in red, blue, or green; color choice can be specified on the shopping cart page. Laser etched and hand inked. |

Circle Packing d6 - white$3.00
The dots on this six-sided die are solutions to the mathematical problem of packing circles in a square: for n circles, what are the largest circles that will fit in a square, and how are they arranged? Single die, in white. Laser etched and hand inked. |
Circle Packing d6 - RGB$2.50
The dots on this six-sided die are solutions to the mathematical problem of packing circles in a square: for n circles, what are the largest circles that will fit in a square, and how are they arranged? Single die, in red, blue, or green; color choice can be specified on the shopping cart page. Laser etched and hand inked. |
Craftsman Style d6 Ivory$3.00
This die was designed using a numbering style and border elements typical of Craftsman-style architecture. Single die, ivory-colored laser-etched plastic. |

Six-sided d6 Number Die$0.50
Six-sided numeral (not pips) die (solid color, opaque), by Koplow Games. Shaped like a cube. We normally stock black, white, red, blue, and green. Your preferred color can be specified in the shopping cart. |
Jumbo Hexahedral Die$2.00
Jumbo hexahedral (6-sided) die. You can state a preferred color in the comments section of order form; we normally stock white and black. |
Chinese/Japanese Numeral Die$1.50
Six-sided die with Chinese/Japanese numerals. |

Arabic Numeral Die$1.50
Six-sided die with Arabic numerals. |
Hindi Numeral Die$1.50
Six-sided die with Hindi numerals. |
Thai Numeral Die$1.50
Six-sided die with Thai numerals. |

Loaded Dice$3.50
This pair of dice is guaranteed to roll 7 or 11 every time. One die has five dots on each face, and the other has either two or six dots on each face. |
Weighted Die - 1's$4.00
Single die weighted to roll lots of ones. Approximately 3/4" across. |
Weighted Die - 6's$4.00
Single die weighted to roll lots of sixes. Approximately 3/4" across. |

Shaved Dice$12.95
Set of four dice, two regular and two "shaved". Shaved dice are a little short in one dimension, in this case the 1-6 direction. This makes the dice more likely to land with a 1 or a 6 facing up. The distortion is subtle (15 mm compared to 16 mm), so that it's not likely to be noticed unless you're looking for it. |
Non-transitive Set of 3 Dice$12.95
This version of non-transitive dice is based on a three-dice set. The first die beats the second in 25 out of 36 possibilities, the second beats the third in 21 out of 36 chances, and the third beats the first in 21 out of 36 tries. |
Non-Transitive Set of 4 Dice$12.95
These dice work in a cycle, such that each die is beaten by another die 2/3 of the time. So no matter which die your "opponent" chooses, you can always choose a die that is likely to roll higher. This set is a variation of Efron's set using the numbers 0-12, which prevents one of the dice from having the same number on every side. The four dice are numbered 2,3,3,9,10,11; 0,1,7,8,8,8; 5,5,6,6,6,6; and 4,4,4,4,12,12. Laser etched and hand inked. Includes a velvet bag for storage. |

Non-transitive Grime Dice (10)$22.95
Non-transitive dice set discovered by Dr. James Grime of Cambridge University. This set has ten dice, two each of five different colors. With five dice, green tends to beat red, red tends to beat yellow, yellow tends to beat blue, and blue tends to beat purple. So you might think green is the best die and purple is the worst. But here's the twist: purple beats green, so there is no best! Even stranger, with two of each color, the order of which color beats which reverses direction. The dice are described in detail in this YouTube video: https://www.youtube.com/watch?v=u4XNL-uo520. The set of ten includes color instructions and a cloth bag. |
Non-transitive Oskar Dice$19.95
Non-transitive dice set discovered by Oskar van Deventer. This set consists of seven dice, each one a different color. If two people select any two dice at random, a third die can be chosen that beats both of them. Oskar describes the dice in detail in this YouTube video: https://www.youtube.com/watch?v=LrIp6CKUlH8. Laser etched and hand inked. Includes a velvet bag for storage. |
Sicherman Dice$9.95
Sicherman dice are the only pair of dice marked only with positive integers that have the same probability distribution for rolling the numbers 2 through 12 as a standard pair of dice. They were discovered by Colonel George Sicherman and reported on by Martin Gardner in a 1978 article in Scientific American. The dice are labeled 1, 2, 2, 3, 3, 4 and 1, 3, 4, 5, 6, 8. Their uniqueness has been proven mathematically. |

Sicherman Dice with Pips$6.95
Sicherman dice are the only pair of dice marked only with positive integers that have the same probability distribution for rolling the numbers 2 through 12 as a standard pair of dice. They were discovered by Colonel George Sicherman and reported on by Martin Gardner in a 1978 article in Scientific American. The dice are labeled 1, 2, 2, 3, 3, 4 and 1, 3, 4, 5, 6, 8 pips (dots). Their uniqueness has been proven mathematically. Laser etched and hand inked. |
d2 Six-sided Die$1.50
A d2 with three sides labeled 0 and three sides labeled 1. Why flip a coin when you can roll a die? |
d3 Six-sided Die$2.00
A d3 with Roman numerals. Two sides each are labeled I, II, and III. We currently have white and blue in stock. You can specify your color choice in the Shopping Cart. |

d3 Six-sided Dot Die$1.50
A d3 with two sides each with one, two, or three dots. (The upper die in the image is a reflection in a mirror.) Only available in white. |
Geometric Shapes Die$1.50
This die has a different geometric shape on each face: rectangle, hexagon, equilateral triangle, circle, pentagon, and square. |
Geometric Shapes Die 2$1.50
This die has one circle on one face, two lines on the second, three triangles on the third, four squares on the fourth, five pentagons on the fifth, and six hexagons on the sixth. |

Math Operations Die$1.00
This die has a plus sign on two faces, a minus sign on two face, a multiplication sign on one face, and a division sign on one face. |
Set of Five Plus/Minus Dice$4.95
Set of five six-sided dice, each marked with three plus signs and three minus signs. Approximate size 5/8" across. |
Set of Five Multiplication/Division Dice$4.95
Set of five six-sided dice, each marked with three multiplication signs and three division signs. Approximate size 5/8" across. |

Set of Five Fractions Dice 1$4.95
Set of five six-sided dice, each marked 1/1, 1/2, 1/3, 1/4, 1/5, 1/6. Approximate size 5/8" across. |
Set of Five Fractions Dice 2$4.95
Set of five six-sided dice, each marked 1/1, 1/2, 1/4, 1/4, 1/6, 1/6. Approximate size 5/8" across. |
Six-sided Dot Die, Mini$0.25
One six-sided die with dots, "mini" size (8 mm across). You may specify color choice in the comments box. We normally stock red and white. |

Six-sided Dot Die, Small$0.25
One six-sided die with dots, "small" size (12 mm across). You may specify color choice in the comments box. We normally stock red and white. |
Six-sided Dot Die, Medium$0.25
One six-sided die with dots, medium size (16 mm). You may specify color choice in the comments box. We normally stock red and white. |
6d6$3.95
Six six-sided dice with dots, ranging in size from 5 mm to 25 mm. Includes a black velvet dice bag. Only available in white. Note that the shape of the 5-mm die is not very accurate. |

Binary d6$3.00
Six-sided die numbered 1-6 in binary. |
d9 Pair of Dice$4.00
These two six-sided dice together create a fair d9 "die". Rolling the pair and adding the numbers has an equal probability of resulting in each of the numbers 1-9. Designed by Eric Harshbarger. Laser etched and hand inked. |
Math Constants Die$2.50
Six-sided die labeled with popular mathematical constants: 0, 1, pi, phi, i, and e. Laser etched and hand inked. |

Math Sets Die$2.50
Six-sided die labeled with number sets: natural numbers (N), integers (Z), rational numbers (Q), real numbers (R), complex numbers (C), and the null set. Laser etched and hand inked. |
Six-sided Die Numbered 7-12$1.00
Six-sided number die numbered 7-12. 16 mm, only available in white. |
Six-sided Die Numbered 13-18$1.00
Six-sided number die numbered 13-18. 16 mm, only available in white. |

Six-sided Die Numbered 19-24$1.00
Six-sided number die numbered 19-24. 16 mm, only available in white. |
Six-sided Die Numbered 25-30$1.00
Six-sided number die numbered 25-30. 16 mm, only available in white. |
Six-sided Color Spots Die$1.00
Six-sided die with a large color spot on each face: red, green, yellow, orange, magenta, and blue. |

Money Die$1.00
Six-sided die with differing amounts of US money, from 1 cent to 1 dollar. |

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