Patent ID: 7985116

Claim:
A piece with a magnet for building a toy, comprising: a magnet having north and south pole faces; a magnet-holding case comprising a frame inside which the magnet is mounted, and at least one spindle provided on the frame; and a body comprising a plurality of ends; at least one spindle-holding hole, provided in an inside circumferential surface of each end, into which the at least one spindle is inserted; and a magnet-case space, provided inside each end, wherein the magnet-holding case rotates about the least one spindle, wherein a plurality of indentations and protrusions are alternately and successively formed on a contact surface of each end, at a given interval of distance or radial prominences and radial depressions which prevent the contact surfaces from sliding with respect to contact surfaces of other pieces, and wherein the body, the magnet, and the frame all have a pierced hole in a middle thereof, which is large enough for a bead to pass through.