Gripmaster Prohands Hand Exercisers Combo Set of 3 - Light/Medium/Heavy Tension (5 lb/7 lb/9 lb) The GRIPMASTER is PROHANDS' signature model. It's ideal for any athlete wanting to develop hand strength. GRIPMASTER offers both men and women an opportunity to dramatically increase hand, wrist, and forearm strength. Prohands exercisers are the #1 selling hand exercisers in the world because Prohands strengthens each finger individually. If you are a pro athlete seeking a competitive edge, a weekend athlete motivated to excel, or a senior wanting to maintain the health of your hands... there is a Prohands model and tension ideal for you.