Daily Exercise Needs:Hand exercise rings build strength in the fingers, hands, wrist and forearms. Varied activities, including crushing, pinching and extensions work to improve the dexterity of both the fingers and hands.Perfectly sized for grip strength training for men, women, seniors and teens. Nonslip Silicone Construction:The hand exercise rings are made from premium silicone, suitable for squeeze, stretch and pull with no odor, no stains, no edges, no noise. The nonslip rings are also tear and crack for long-term use.Double force grip rings to give you a better workout. Rehabilitation & Prevention:Perfect for rehabilitation therapy, fitness and relaxation, more forearm Muscularity. Hand grippers can also help with pain or prevent arthritis relieve symptoms of tendonitis and rheumatoid arthritis and aid recovery from a fracture of the hand. Fits All Hand Sizes:Ideal for athletes(tennis, basketball, boxing, golf and )and musicians (guitar players, bass players, pianists and violinists). Portable and easy to fit in bag or pocket. You can get repetitions in while driving, at the office or anywhere! Color: black Material: Silicone Package Contents: 2 x Grip Strength Trainer 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.