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This twenty sided die is numbered in a spindown pattern. This means that consecutive numbers are next to each other, which makes it easier to use it as a life counter in (card)games such as Magic: the Gathering. If do want to use this die for rolling though, you can because it is designed to be balanced and give a fair result.
The faces of this d20 are shaped from spiraling ribbons of steel that encircle the numbers. This design is quite a bit larger than ea regular spindown d20, and it measures about 32 mm across its opposing faces.