D120 Disdyakis Triacontahedron The Dice Lab 120 Sided Die – Choose Your Color




Roll a 1 to 120 in style with this very unique and fun die!

The d120 is the ultimate fair die allowed by Mother Nature (i.e., mathematics)! The d120 is based on a polyhedron known as the disdyakis triacontahedron. Each face is an elongated triangle. These dice are perfectly numerically balanced, with the same sums for numbers around vertices of the same type.

The d120 can be used as a dn, where n is any proper factor of 120, including all of the dice in a standard seven-dice polyset (4, 6, 8, 10, 12, and 20). To do so, simply group a range of numbers into a value. For example: if you want to use this d120 as a d4, count any roll 1-30 as a value of 1, 31-60 as a value of 2, 61-90 as a value of 3, and 91-120 as a value of 4.

Choose your color, or collect them all!

WARNING: CHOKING HAZARD – Small parts. Not for children under 3 years.

Additional Information from the manufacturer on the d120
Our d120 is based on the disdyakis triacontahedron. This is the world’s first injection-molded d120. 120 is the maximum number of faces possible in an isohedron, excepting dipyramids and trapezohedra, which aren’t workable solutions for physical dice with more than about 50 faces. Even requiring the pairing of opposing faces in conventional fashion, with 1 opposite 120, 2 opposite 119, etc, the number of possible numberings is astronomical. After weeks of searching with sophisticated techniques, Bob Bosch, a mathematician at Oberlin College, found a solution that perfectly balances the sums for all of the vertices. Twelve vertices have ten faces meeting at them, twenty have six faces, and thirty have four faces. In order to allow adequate space for numbers and firm settling on a face, our d120 is unusually large for a die, with a diameter of 2″ (50 mm), and a weight of 0.2 lb. (95 gm.)

Additional information


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