This is a "puzzle" type whimsy. It is made of carved wood, one wire keeper, and one safety pin holding the pieces from being removed from the bottle. This is similar to some of the trick 'stoppers' sometimes seen, but this is NOT a trick. All pieces are solid, the safety pin is real and all parts fit loosely so as to show there is no trickery involved. The safety pin was the last piece placed while all of the wooden pieces were in the bottle.