Features Adjustable Finger Exerciser and Hand Strengthener: Change the positions of the hook to adjust the resistance value, 6 levels resistance( Heavy Black: 13 lbs, 17 lbs, 21 lbs and Light Grey: 6.6 lbs, 8.8 lbs, 11 lbs), Suitable from beginner to advanced. Physical Therapy & Rehabilitation: Hand workout equipment for arthritis, stroke rehab, carpal tunnel, tenosynovitis, fractured, tendon surgery and tennis elbow, reduce stiffness and pain. Athletes & Musical Instruments: The grip strength trainer kit is works for improving power and flexibility in the wrists, fingers, and forearms. Gifts for rock climbers, Tennis players, Guitar, Piano, Drummers & Musicians. Durable & Ergonomic Design: Adjustable hand extensor exerciser can be worn comfortably by any size wrists and finger, Suitable for finger workout habits. Suitable for Teens and adults.