The hand grip features foam handles to ensure a comfortable grip and resistance springs to increase the strength of the forearm and the hand grip. The hand grip strengtheners can be used to strengthen the muscles in the hands, arms and wrists. They can also help to enhance your performance when taking part in sports such as mountain climbing, gymnastics, motocross, horse riding and weight lifting. Resistance approx. 11 Kg Grips many differ in colour and not be as pictured.