With the SKLZ® Grip Strength Trainer, you can build strength in your fingers, hands, and forearms while easily adjusting the resistance, up to 90 lbs. Grip Strength Increase grip strength and endurance by training fingers, wrists and forearms Easily adjust resistance from 20 lb. to 90 lb. to fit any training level, beginners to advanced Great for rehabilitation, increasing hand and forearm circulation and stress relief Curved design and anti-slip handle provide secure grip and comfort Compact size and shape so you can train anywhere Additional Details 1 year limited warranty.