Features 1、Help prevent injuries and muscle imbalances from the overuse of "crushing" type hand and finger grip exercises. 2、 The strength trainer is ergonomically designed and fits well for all hand sizes, which perfect for men, women, seniors and teens. It is great to fit into your gym bag or handbag. You can get repetitions in while commuting, at the office or anywhere! 3、 Portable, durable, no odor, no stains, no edges, no noise, easy to use. Use different balls to restore range of motion.  4、 Free of the "squeaky" noise some some traditional grippers make so that you don't disturb anyone around your and most importantly for your own sanity. 5、 Improve finger strength for athletes (basketball,rock climbing enthusiasts, fitness, tennis, baseball, boxing, tennis, golf and shooting) and musicians (guitar players, bass players, pianists and violinists).  Material: Food Grade Silicone Size: about 10 * 8 * 0.8cm / 3.9 * 3.1 * 0.3inch Weight: 12g / each Role: Finger exercise to promote finger flexibility 3 Handles: Low intensity (green), intensity: 3kg / 6.6LB; Medium intensity (lake blue), intensity: 4kg / 8.8LB; High intensity (orange), intensity: 5kg / 11LB Quantity: 3PCS(1 pcs per intensity) Package List 3 pcs Finger Hand Grips (1 pcs per intensity)