"""[Hand Grip Strengthener] - Resistance: 50 - 60 lbs; Thickness: 18mm/0.71""""; Total size: 70mm x 70mm/2.76"""" x 2.76"""" (L*W); Outer diameter: 70mm; Inner diameter: 34mm x 26mm / 1.34"""" x 1.02""""[Material] - Made of durable silicone material, it has the characteristics of good deformation resistance, high elasticity, not easy to tear or break, and can be used for a long time.[Features] - The surface has small dot texture, comfortable grip, and very suitable for your hand or finger. Suitable for people of all ages, it can enhance hand strength, improve finger and hand flexibility, and reduce fatigue and stress. In addition, it can also help balance and improve your grip to meet your daily exercise needs."""