The SKLZ grip strength trainer is adjustable from 20 lbs to 90 lbs of resistance to help increase finger, hand, wrist and forearm strength. This grip trainer is also a great tool for rehabilitation, circulation and stress relief. The trainer's curved design and anti-slip handle provide a secure grip and comfort during workouts. Measuring 4.5" x 6", this compact grip trainer is small enough to take with you for training on the go.