DURABLE AND STRONG - The grip strength trainer is made of high quality durable aluminum knurled handles and high quality spring. Non-slip, durable, not easy to rust. Provides a comfortable grip and feel, improves the grip of the palm and relieves mental tension. Ultimate training: Our hand grip trainer contains 3 handles of different strengths, you can break through your limits again and again through three different force grips and feel the increase of your own strength. Ideal for daily strength training. Ideal for finger, wrist and forearm training, building hand strength, increasing grip and flexibility of fingers for climbers, athletes, sports, fitness trainers, fitness, musicians and people who want to train their hand, wrist and fingers. TRAIN YOUR HAND ANYWHERE - Thanks to its pocket size, you can take these hand grips anywhere and train anywhere. With this strength trainer you can exercise every day to heal hand injuries, rheumatoid arthritis, carpal tunnel syndrome, tendonitis, broken wrist and tendon surgery.