Three sided die

This is a three-sided die, with the special feature of clearly showing the value on a flat surface, face-up.
The roller is based on a Reuleaux triangle, with the corners slightly clipped to improve its rolling characteristics.
The numbers are sized such that the same amount of material is present in each face.

I believe that this three-sided roller form is superior to a cubic die with paired values, because an unscrupulous player able to throw a die such that it rotates on one axis can reduce their exposure to undesired values. (This is the case for all possible layouts of a d6, which stems from the fact that four is not divisible by three).

About this set

I designed these roller dice to fill in the awkward low numbers : three, five and seven faces. I also have a four-sided roller dice in a similar form, because tetrahedral 'caltrop style' dice are horrid and don't have the value-face-up property.

Although solid, and perfectly servicable, I find the plastic version a little light for comfortable throwing. If you can afford it, I direct you to my 'pepperpot' series (D3 D4 D5 D7) which are the same forms in hollow stainless steel (approximately three times the cost of plastic).