You want to develop serious strength and this hand grips is here to help. If you're ready to improve your grip, and overall fitness, then you're going to like what your arms look like after using these grip strengtheners. Features - Color: Silver. - Material: Aluminum and Spring Steel . - Size: 13.00X10.50X2.20cm/5.11X4.13X0.86in - 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 - These aluminum handles are knurled to ensure a non-slip surface. Which may be a little rough on your hands but that's what calluses are for anyways - With hand strengtheners from 90 KG strength resistance, there's plenty of demanding options to keep you busy. Let's get you started already - Great for anyone looking to improve hand strength our grip strengthener is for climbers, weightlifters, cross fit athletes, and more Package list: 1 x Heavy Grip