he hand grip strengthener is the highly effective exercise device for hand,finger,wrist and forearm muscle development. An excellent training tool suitable for anyone who requires to build up hand and forearm strength. Features Singer hand power grip athletes pianists guitarists love. Sturdy and robust design with stainless steal tension springs and non-slip handles. 22-88lbs(10-40kg) adjustable range,you can adjust the strength tension from 22lbs to 88lbs by turning the rotary knob. Exercise the small muscles in your hands and arms that would otherwise be missed. Gain strength in hands,wrists,fingers and forearms for better performance. Typically they are small equipment so you can use them whenever and wherever you want. Specifications Material:stainless steel & rubber Resistance range:22-88Lbs(10-40kg) Package incuded 1 Adjustable hand grip strengthener Size:5.4*8.3*1.18 inches Weight:0.4 lbs