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A Reuleaux Triangle of revolution with constant width 3cm. Hollow with internal stiffeners. Now sold separately so you can get a set dyed in different colors.
Any triangle can be turned into a curve of constant width, and these can be turned into a surface of revolution provided the original triangle is isosceles. An interesting case is the 45-45-90 triangle, which produces a solid which looks like a "standard" Reuleaux Solid (made from an equilateral triangle) with a rounded tip.