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