Check the listing for details. ProHands Gripmaster Hand Exerciser - Yellow (Extra Light Tension). Condition: New. Listed at 19.95 USD. ProHands’ Signature Hand Exerciser 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. Note: Consult your physician before starting an exercise program. If you experience pain or discomfort, stop immediately and consult your physician.