1. Material: silicone2. Applicable scenarios: fitness3. Dimensions: the outer diameter is 7 cm, the inner diameter is 3.3 cm, and the thickness is 1.8 cm4. Weight: 50g5. 30 pounds is suitable for hand rehabilitation, 40 pounds is suitable for women and most people, 50 pounds is suitable for men and office workers who relax and relax muscles

http://olla.gr/silicone-grip-strength-finger-exercise-rehabilitation-silicone-ring-blue-40lb/