The PRO series Finger and Hand Exercisers from Accu-Net, manufacturers of the Gripmaster Series of hand, finger, and forearm exercisers are the most advanced hand exercisers and considered the top-of-the-line models in the Gripmaster product lines. They are ideal for professional athletes, musicians, marksman, and motivated individuals seeking maximum performance and training of the hands, fingers, and forearm muscles. The PRO Series expands on the ingenious design of Original Gripmaster model by providing a larger design, ideal for bigger hands or those wanting greater stretch in the palm, required for more advanced strength training routines. The black finger-tip grips minimize slip during exercise. The PRO Series is available in four (4) resistance levels. Available tension/resistance levels include: * Blue-Light Tension (5 lbs. resistance / finger) * Red - Medium Tension (7 lbs. resistance / finger) * Black - Heavy Tension (9 lbs. resistance / finger) * Gray - Extra Heavy Tension (11 lbs. resistance / finger) Our multi-pack sets provide different tension levels, recognizing the strength need of different fingers and muscle groups. Whether you are a rock climber, musician, football player, basketball player, marksman, or recovering from a repetitive motion injury such as carpal tunnel syndrome, or surgery, you are sure to find the Gripmaster Pro Series Exercisers the best hand strengthening tools on the market.