FIT4TUNE Adjustable Hand Gripper Ring Exerciser & Ebook Set Adjustable strength 22-88 lb Fits small & large hands, men & women, wrist forearm fingers workout Helps rehab from tendonitis, arthritis, tennis elbow and carpal tunnel. Ideal for rehabilitation from hands injury, physiotherapy and surgery therapy. Great exerciser for musicians, bikers, rock climbers, baseball and tennis players The FIT4TUNE set is the best choice for you; 1 Year warranty! 100% money-back guaranteed