Since 1975 Creative Hobbies brand has been known for supplying top quality products to our customers worldwide. This offer is for a Pack of 8 Childproof Safety Winder Keys for Wind Up Music Boxes. Manufactured by Sankyo, the world's leading producer of musical movements, these keys screw onto the winder post of standard wind up music boxes and cannot be removed once screwed on. This prevents children from swallowing the keys so the music box movements can be used in toys and stuffed animals. Keys have a round collapsible flap knob so there are no sharp edges exposed on the key. Bright nickel finish. Size refers to the overall length of the winding key post section only (does not include the round flap).