This d120 die has one hundred twenty triangular faces numbered 1-120 and glows in the dark after being placed in bright light. The shape is a fully-symmetrical polyhedron (an isohedron) known as the disdyakis triacontahedron. This shape is the ultimate fair die allowed by mathematical symmetry. The numbers are distributed perfectly uniformly, so that the sums of the number groups of each type are uniform. E.g., the twelve groups of ten numbers all sum to 605. The die is 2.0" (50 mm) in diameter and weighs 1/5 of a pound (0.1 kg). This unique object will amaze and fascinate math lovers and gamers alike! Includes black velvet bag with embroidered Dice Lab logo.