Creative Hobbies Winder Turntables are designed to replace the winding key on most major brands of wind up musical movements such as Sankyo or Yun Sheng music boxes. Turntables thread onto the winding shaft of your music box on the bottom, and then are used to wind it up to play. As the tune plays the turntable rotates counter clockwise. At no-load, turntables will turn at approximately 1-1/2 rpm. These turntables are made from clear plastic that is 1/8" thick x 1.5" diameter x 5/8" (16mm) long stem. Pack of 12 pieces!