Material: made of high quality eco-friendly silicone, it can be fully stretched, not easy to break Easy to use: the finger stretchers have 5 small holes to adapt to your fingers, which provide enormous resistance to fully open your hand 3 levels of resistance: light blue 6.6 lbs, blue 8.8 lbs and dark blue 11 lbs, gradually increase the difficulty of your workout Lightweight and portable: exercise your hands and forearm from anywhere, whether you are at home, in the office, while walking, in the car or doing your favorite sport Wide Application: Suitable for Rheumatoid Arthritis, Arthritis, Carpal Tunnel, Tendonitis, Tennis Elbow and is about to recover from a fractured or broken wrist, or when typing, texting or any other activity that uses your grip muscles