18 Note Wind-up Music Box Movement Clockwork Mechanism Replacement Silvery Music Box Spare Part Mechanism for DIY Music Boxes with Key Screws 1，Tune: part of melody, about 18 seconds of the song 2，Style: 18 Note Wind up Movement. Size:About 3，5.0cm*4.5cm*2.0cm (1.97"*1.77"*0.78") Weight: About 50 grams (1.75 oz). Each movement is designed for just one tune(part of melody, about 18 seconds of the song). 4，How to use: Install the movement to your own DIY music box with included key and screws. Wind up the key then release it, it will start to play music. 5，Notes: Please be noted that the package will include only musical movement for DIY musical box as the picture shown, NO music box Included. It is not a completed music box。 If you have any questions, you can contact us.