Features: -Professional grip strength device, enhance grip strength, exercise muscles, help promote blood circulation, keep joints alive, and not easy to cause inflammation. -Double-layer thickened knife spring, thickened and hardened steel block, not afraid of wear and deformation. -5-165kg upgrade heavy weight, adjust the distance according to your heart, to meet different needs. -Ergonomic design, uniform force, comfortable force, full of elasticity. Specification: Material: ABS Adjustable: 5-165kg Colour: black&orange Package Included: 1x Grip 1x Lanyard