Pinkish red, richly colored nylon plastic with a smooth finish.
About this Product
Three different solids of constant width 4 cm. These are hollow and have internal stiffeners. Each is a solid of revolution from a different plane curve. You get a Reuleaux triangle, a rounded Reuleaux triangle, and a Reuleaux pentagon. All of them have width 4 cm in any direction. They are about the size of ping pong balls.