Pursuestar 18 Note Gold Plated Windup Musical Mechanism Movement DIY Clockwork Music Box with Key Screws - Over The Rainbow Size: approx. 5.0cm*4.5cm*2.0cm (1.97"*1.77"*0.79") Material: shining gold-plating metal, quality made, expensive looks. The sound power from spring, use the key to turn the spring tightly, then release and will be playing Therapeutic function for kids and adults - holding this little music movement, winding it, watching the little gears move, and listening to the music, which in itself is soothing to the ears. You can install the movement into a DIY box, such as paper box, wooden box, glass box, plastic box and metal box, you can create your own music box. You will be very excited after finishing your artwork. And it is also a precious and meaningful gift for yourself and your friends. Or you don't need to put it in a box, just play the movement on the desk, seeing its gears move, listening the pure tune, very interesting!