Features: * Curvaceous design with ergonomically and compact structure， user friendly.  * It is very comfortable while practice. * Practice without your instrument anywhere anytime， it could be use for strengthen palm， fingers， wrists and other area of hand. * The resistance levels could be adjustable， suitable for the auxiliary exercise of instrument playing， physical exercise and other activities. * Compact and ultra-light design means you can carry it in your pocket， bag or instrument case. * Resistance adjustable range: 4-7pounds * Size: 83 x73mm * Color: Random Packages: * 1 x Hand and Finger Exerciser * 1 x User Manual