Solids of Constant Width (Set of 3)

These solids of constant width behave like spheres. This is because, regardless of the peculiar shape, the diameter is still equal at every point. You can demonstrate this property by setting a flat object, like a book, on them and it will roll as smoothly as if the object were on spheres. Additionally, these wonky shapes won't roll away. The precise shape is an orbiform based on the revolution of a Reuleaux triangle. Sold in sets of 3. Size: 30mm (1.18 in) Material: 3D printed using Woodfill PLA   More info (from Wikipedia): The Reuleaux tetrahedron is the intersection of four balls of radius  centered at the vertices of a regular tetrahedron with side lengths. The spherical surface of the ball centered on each vertex passes through the other three vertices, which also form vertices of the Reuleaux tetrahedron. Thus the center of each ball is on the surfaces of the other three balls. The Reuleaux tetrahedron has the same face structure as a regular tetrahedron, but with curved faces: