18 note, key wound music box mechanism with beautiful rich sound. Supplied with swivel key which extends 1/2" from base. Music box is 1-7/8" x 2-1/8" x1-1/8". You can also attach a crank or wire shaft for various applications using the side power take off. Simply drill a hole in the shell for access. Windup music boxes are ideal for wood toys, ceramics, boxes and fiber /doll crafts.