Our Creative Hobbies E242 Side Lever On/Off Assembly attaches easily to 18 note Musical Movement to stop music from playing when lever is moved to the side. Easy to install, take the cover off the music box (if it has a shell cover) Simply remove one screw and install lever with parts provided. Lever measures 2 inches long overall and is gold color metal. Great for use with music boxes of your own design. Instructions for use included. Package includes parts to convert one music box.