TA360 GyroBall Gyroscopic Wrist-Forearm Exerciser & GripSaver Rubber Forearm/Grip Strengthener | (25lb Resistance) for Tennis, Racquetball, Squash, Golf, Bowling, Baseball, etc - 2 Item Bundle GyroBall: Spin-spee determine ho hard you muscle work. Strengthen your fingers, wrists, forearms and shoulders, Gyroscope reaches up to 10,000 rpm, LED lights inside illuminate. Simple start with included pull-string. GripSaver: Premium silicone 25lb resistance ring. Finger, hand and forearm strengthener and endurance builder that fits both men and womens hands. Great combo for tennis players and all training athletes to give your game that performance boost you are looking for plus protect yourself from Tennis Elbow. Compact and portable, so you can keep in your tennis bag, at work or home. Use daily and feel thedifferencein just a few weeks.