If You want to develop serious strength and this hand grips is here to help. The strength trainer is ergonomically designed and fits well for all hand sizes. Small exterior, convenient to carry, can exercise at any time. Features - Color: Black. - Material: Silicone and Spring Steel . - Size: 9.5 x 5.4 x 2.7 cm. - The heavy grips hand gripper series was developed for athletes who want to take the training of their grip strength to the next level. - If you want to develop serious hand strength for a sport, or just want to impress your friends, then the heavy grips hand grippers are the perfect choice for you! - Great for anyone looking to improve hand strength our grip strengthener is for climbers, weightlifters, cross fit athletes, and more. - Small exterior, convenient to carry, can exercise at any time. - Non-slip handle design for easy and comfortable to grip. Package list: 2 Grip Steel