Specifications: Product size: 7.5 x 4 cm / 2.95 x 1.57 inches (Length x Width) Thickness: 2 mm Material: Silica gel Side hole diameter: 1.3 cm / 0.51 inches Center hole diameter: 1.8 cm / 0.7 inches Weight capacity: 30-50 lbs Package: 3 x Wristbands Uses: Great for rheumatoid arthritis, osteoarthritis, cystitis, carpal tunnel syndrome, tendonitis, tennis elbow, and those recovering from a sprain or fracture of the wrist, or when typing, texting, or any other activity that uses your gripping muscles. Finger Exercise Bands: We have provided three difficulty levels: Level 1: 3 kg / 6.6 lbs - ideal for beginners or those recovering from injury. Level 2: 4 kg / 8 lbs - for those just starting forearm isolation exercises. Level 3: 5 kg/11 lbs - Ideal for advanced users, perfect for a variety of uses, from sports like basketball, football, hockey, golf, and bowling to strengthening guitar and violin fingers, hand exercises, and more. Enjoy 3 levels of resistance as you progress. Level 1 - Light Blue, Level 2 - Royal Blue, Level 3 - Dark Blue. How to use the finger exerciser? Tip 1: Place the rings over each finger, starting with the fingertips closest to each other. Tip 2: Slowly spread your fingers, hold for 3 seconds, then slowly relax. 1 to 30 repetitions in three sets. Usage and Caution: 1. Reusable and easy to clean with water or soap. 2. Air dry naturally or with paper, not in direct sunlight. Welcome to Petri Store. If the product you received has any problems, don't worry. Just contact us, and we will provide you with a satisfactory solution. Feel free to contact us if you have any questions.