1.Pleasant sound and helpful to train your rhythm. 2. Finger Rhythm Sand Shakers are a good helper for you while you playing guitar ukulele. size:2.5 x 4cm Material:Plastic + Metal colour:black Package Contents: 6 x Finger Shaker Only the above package content other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.