Cast Puzzles, Copyright Hanayma Co. 2008.
(metal, 2 inches)

Three spiral shaped pieces with carefully placed bumps and cuts on them (in different places for the three pieces) slide together. Although they feel loosly linked together when holding the puzzle assembled, the fit is very exact when dissassembling or assembling (a littly bit of force is required to make the puzzle spring loose on the first dissassembly step or back together on the last assembly step).