Tennis players, golfers, bowlers, and anyone needing a strong grip, this product is a must! The Original Dyna-Flex Pro is entry level gyro that everyone is talking about. The rotor, which can reach speeds of up to 9,000, rpm and puts out 35lbs. of torque, features a new "thermo band", which aids the user in controlling this powerhouse. The Dyna-Flex Pro a newly designed fun and almost addicting new product that is not only can be used as an executive relaxer, a carpal-tunnel/arthritis reliever, or a strength and coordination builder, but will knock your socks off! Wherever tasks necessitate repetitive wrist motions that includes flexion, extension and rotation or if you suffer from carpal tunnel syndrome or repetitive motion trauma then, the Dyna-Flex is a product that you should be using or at least trying out once. We challenge you to take hold of the Dynaflex Pro when it's moving at 9,000 rpm's!