Thank you for viewing. The transparent sheet on the surface allows you to enjoy a drum-like sound when tapped, as the beads inside vibrate. You can also visually enjoy the movement of the colorful beads, and a gentle wave-like sound is produced when moved slowly. By tapping or shaking it, and experimenting with the speed, you can discover various ways to enjoy the sound. There are small dents, bead blockages, and minor scratches from use. Please understand that this is a used item and purchase accordingly.