Description You can alternate workouts, with a gradual increase in resistance making each workout progressively more difficult. Made of silicone material with round shaped design.Relieve hand muscle fatigue, very suitable for people who use computers for a long time in the office, especially for people who are used to the hand. Features -Color:Blue -Material:Silicone -Size:7.80X7.80X2.20cm/3.07X3.07X0.86in -This hand gripper ring is silicone made, which is flexible and safe, you could keep it for a long time. -Our hand grip tool owns the strong wear, tear and break resistance ability. -Suitable for tennis player, mountain climber, rocks climber, musician, guitar player, violinist, etc. -This is a creative and generous product, with round appearance and practical design. -The hand grips exerciser is easy to use, you can just simply hold it firmly with your palm and fingers then release and, repeat this process, exercise at the place you like. This hand gripper ring is silicone made, which is flexible and safe, you could keep it for a long time. Our hand grip tool owns the strong wear, tear and break resistance ability. Suitable for tennis player, mountain climber, rocks climber, musician, guitar player, violinist, etc. This is a creative and generous product, with round appearance and practical design. The hand grips exerciser is easy to use, you can just simply hold it firmly with your palm and fingers then release and, repeat this process, exercise at the place you like.