Hand Strength Grip Trainer Multifunction Forearm Strength Force Fitness Springs Power Wrist Arm Exerciser Strength of Arm Gym Features: Comfortable to hold: The handle of the 8-word energy system is covered with a layer of NBR material, which is tender and cozy to hole for long time Easy to operate: The 8-word energy device is straightforward to operate, no complicated activity and different tools requirement Practical: The 8-word strength system can efficiently assist you to to train your chest muscle and arm muscle, convenient to exercise at home, office, gymnasium and so on Two resistances of spring available There are 4 resistances of spring out there for you to choose, adding 10kg,15kg, 20kg and 30kg, sufficing diverse needs Scope of application: The 8-word strength gadget is extensively appropriate for student, white collar, adolescent, the elderly, fitness fanatic and so on Note: 10kg is suitable for female / younger athletes / elderly people, it improves the power while exercising the arm 20kg is acceptable for health those that have bound standards on arm power Specification: Quantity: 1pc Material: ABS + NBR + steel Package: 1* 8-word energy device