Featrues 1. Strengthen Grip and Improves Dexterity: Hand exercise rings build strength in the fingers, hands, wrist and forearms. Varied activities, including crushing, pinching and extensions work to improve the dexterity of both the fingers and hands. Perfect for athletes, musicians and physical therapy patients. 2. Resistance Levels: Different colors have different resistance levels. The color coded includes Blue: 40/50 lb, Orange: 50/60 lb, Black: 70/80lb. Please choose the one that suits you. 3. Perfectly Sized for a Comfortable Fit: Sized to comfortably fit adult hands with an diameter of 8cm. Perfectly sized for grip strength training for both men and women. 4. Portable and Widely Use: Ideal for climbing, string musicians, gymnastics, hunting, fitness and gaming. 5. Satisfactory service: If you have any questions about this project, please feel free to contact us. We will do our best to provide you with a pleasant shopping experience. Specification Material: Silicone Color: Black Blue Orange Size: Dia 8cm Package Include: 1 Finger Exerciser