Package: 4 pack hand grip strengthener, Resistance: 50 100 150 200 lbs. Features: hand exercisers for strength,forearm strengthener,heavy duty resistance, rust proof coated spring,solid aluminum handles,non slip grip, ergonomic design. Portable applications: strength and flexibility training for forearms, wrists, fingers. Rehabilitation of hand injuries, rheumatoid arthritis, arthritis, carpal tunnel, tenosynovitis, fractures, broken wrists, tendon surgery, etc.