PORTABLE DESIGN: Extremely portable design, you can carry finger strengthener in your luggage, pocket, purse, handbag etc., strength your at any time when you . SUITABLE: The hand grip exerciser is suitable for finger strengthening for guitar, piano, trigger ringer training, arthritis and rock . DIFFERENT TENSIONS: Highly versatile and fully adjustable hand exerciser and finger strengthener. Selecting different tensions for each finger . Easy to use and allows you to the grip strength of each digit based on current and results. PRACTICAL: versatility means it's also great if you need to rebuild hand strength or . It can work alongside , or separately, to help from surgery, trauma, stroke, damage as as countering repetitive strain injury, arthritis and carpal tunnel. Exercising hand muscles and joints helps support these vitally important joints and keep healthy. size: 8.8cm*2.15cm*6.7cm Material:ABS colour:black Package Contents: 1 * Finger force Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.