This twelve sided die is meant to keep track of the number of energy counters you collect from cards in the Kaladesh expansion for Magic: the Gathering. To make finding the right number easier, the numbers on this die are arranged in a spindown
pattern. This means that cansecutive numbers are placed next to each other. This breaks the conventional ordering of numbers on dice, in which the numbers on opposing sides sum to the number of sides + 1.
This d12 is primarily intended to be used as a counter. However the design is also well balanced, so that it gives a fair roll. The die measures about 22 mm (0.9 inch) from tip to tip,and about 18 mm (0.7 inch) across oposing sides. Printed in steel, it weighs about 6.5 grams.
The design of this die is meant to fit with the visual style of the latest expansion set for Magic: the Gathering, called Kaladesh. See here
for all my Kaladesh themed dice.