Specifications for Versatile Hand Exerciser for Strength Training: Material: High-Quality Silicone, Durable Plastic Design: Ergonomic, non-slip grip, compact and portable Dimensions: Length: 9cm Width: 2cm Height: 8cm Weight: 80g Functionality: Improves Grip Strength, Dexterity, and Flexibility Type: Finger Exerciser Type of sports: Strength Training Training Site: Hand Function: Muscle Relex Apparatus Work out each finger trainer separately, or the full arm strengthener. Individually isolate and develop each finger's strength, flexibility, and endurance. Develop exceptional hand, wrist, and forearm strength. Whether you're warming up before a show or conditioning away from your instrument, the Logest is the ultimate portable exercise tool. You can keep your fingers, palms, and forearms gripped and synchronized at work, home, or on the train. Our Carpal Tunnel Light Resistance Trainer is ideal for novices and people recuperating from surgery, and it provides 3 pounds of strain. The middle level contains 7 pounds. Tension and heavy-duty hand strengtheners are available in 11 pounds of tension.