Features:<br> - Simple to start with a pull-string.<br> - The faster you spin the harder your muscles work.<br> - Internal LED bulbs will light up when the ball is in motion.<br> - Small, compact and transportable, you can take anywhere.<br> - It is powered by rotating the wrist and the speed can reach up to 12.000RPM.<br> - Rehabilitates sore muscles and joint, great for musicians, guitarists, pianists, drummers.<br> - All you need do is to increase the speed by making a rotational wrist movement and to keep in sync with the spinning of the ball.<br> - Strengthen fingers, wrists, hands, forearms, shoulders and bicep etc., and also be beneficial in promoting co-ordination and blood circulation.<br> Specifications:<br> Material: PC + PP<br> Size: 7cm(Dia.)<br> I<br> Package list:<br> 1 * Wrist ball<br> Notes:<br> 1. Manual measuring, please allow 1 ~ 3mm error, thank you.<br> 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store