Specifications:Features:- The design of curve， practice is very comfortable and avoid fatigue and pain.- The strength can be adjusted freely between 4 ~ 7 pounds through turn adjusting gear in the product.- It can practice the hand multiple parts， such as the palm， fingers， wrist， etc.- It can safely practice the finger endurance， tension， flexibility， coordination.- It can help you improve the speed of play and sensitivity.- It suitable for people of all age.Color: BlackApplication: Palm / fingers / wristProduct Dimensions(L x W x H): 90 x 25 x 72mmProduct Weight: 73gPackage Dimensions(L x W x H): 128 x 166 x 35mmPackage Weight: 95gApproved: CE / FCC