The ProHands Gripmaster is the company’s signature hand exerciser, and it’s a great way for athletes and fretboard warriors to build strength, dexterity, and endurance. Designed for adults with average-sized hands, this time-tested training device isolates and strengthens each of your fingers. At Sweetwater, we’ve found that — over time and with dedicated consistency — the Gripmaster increases hand, wrist, and forearm strength. If you’re looking for a way to bolster your performance, the Gripmaster Hand Exerciser is the perfect tool for you.