Features 1. High Quality Material: The finger trainer is made of silicone, which has good elasticity, is not easy to tear, and is safe, environmentally friendly, and durable. It is everyone's hand trainer and finger trainer. 2. 4 Resistance Levels: The grip strength trainer silicone provides you with 4 resistance levels, including 11 pounds, 13 pounds, 17 pounds, and 21 pounds. You can choose the appropriate training level based on the thickness of grip strength. 3. Lightweight and Portable: Our hand muscle trainer is small in size and looks elegant. The compact design allows you to easily store it in your pocket or handbag for easy access at any time. 4. Relieve Fatigue: The palm trainer can improve the strength and flexibility of the wrist, fingers, and forearm. The grip strength trainer is also suitable for people who frequently use computers and mobile phones, which can alleviate hand fatigue and discomfort, and prevent joint and muscle pain. 5. Perfect Gift: Hand training finger trainers are widely used for mountaineering, fitness, baseball, boxing, guitar, bass, piano, violin, driving, typing, work, and any training that requires finger strength. The silicone finger trainer is an excellent gift for mountaineers, athletes, musicians, and office workers. Specification Material: Silica Gel Color: Black, Grey Size: 15 x 11 x 3 cm Weight: 75 g Package Include: 1x Five Finger Stretcher