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Build your grip with the Adjustable Strength Hand Power Grip Trainer - 10kg to 40kg. Adjustable range of 10kg to 40kg - study and robust design Great for improving strength, endurance and muscular tone Ideal for rock climbers, tennis players, surfers and musicians Fits both small and large hands - seniors, teens and more. For 4.99 pounds feel strong with the Adjustable Strength Hand Power Grip Trainer