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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.