Features: 1. 2 Kinds of Resistant Levels: The finger exerciser provides you with 2 kinds of levels of resistance levels, 6.6LB, 8.8LB, 11LB or 13LB, 17LB, 21LB. You can choose the appropriate level according to your grip strength. 2. Silicone Material: Hand grip strengthener is made of silicon with great elasticity, safe, environmentally friendly, skin friendly. 3. Portable And Lightweight: Finger trainer is small and light enough to fit in gym bag or pocket, you can exercise your hands anytime, anywhere with it. 4. Multipurpose: The strength training device is ideal for rock climbing, ball sports enthusiasts, and musicians to increase the strength and flexibility of the fingers. It is also suitable for people who regularly use computers and mobile phones to relieve hand fatigue and discomfort and prevent joint pain and muscle aches. 5. Ideal For Sports Lovers: Finger strengthener can improve the finger strength of athletes (rock climbing, fitness, tennis, baseball, boxing) and musicians (guitar, bass, pianist, and violinist) and daily housework (driving, typing, writing, working, etc.). Specification: Material: Silicone Product Color: Black, Grey Product Size: 11 x 3 x 11cm Product Weight: 40g Package Included: 1 x Finger Strengthener