The shape of the Reuleaux Mastermorphix is formed by Reuleaux triangles, so the distance from a corner to each point of an opposite edge is constant. Several TwistyPuzzles forum members built this puzzle, as Frank Schwartz, Adam G Cowan (Puzzlemaster42), tattooed, Sven and also Matt Davis, who built mine. Weight: 180g Size: edge length 7.5cm