Are you still using inefficient and dangerous fitness equipment? You should select a safer and more effective arm fitness equipment for yourself! Try hydraulic power twister, you will like it ! More safer and durable compare to the spring power twister duo to the patented hydraulic adjustment system principle More stable resistance and effective exercise,fixed triangle center design, exercise is more stable,safer adjust the angle, the opening angle is unchanged, the exercise stroke is also unchanged and it is more effective for muscle training Save money, you don't need to buy different resistance arm exercise tool 50kg, 70kg, 90kg etc,The strength of this arm exercise training machine can be adjusted from 10-150kg, meet your different intensity requirements. Easy and convenient to operate,comfortable PU soft rubber handle,wear-resistant and non-slip.Handle storage buckle for easy storage and easy carrying. User-friendly design. The back button can be fixed after folding. Professional micro-rebound, refused to rebound sharply, completely solve security risks, let you safe and fitness, do not hurt people, micro rebound, security Package Contents: 1 x Training arm machine