Adjustable: power twister arm exerciser can adjust different resistances by turning the resistance button, which is more user-friendly than traditional spring arm strength devices. Exercise your arms: adjustable power twister can help men to exercise chest muscles, abdominal muscles, arm muscles, back muscles, etc. You dont have to worry about twisting, because exercise is a gradual process. Triangle structure: it never deform, break or hurt people. With the adjustable hydraulic arm strength trainer, you could adjust the resistant power exactly fit your strength, so your muscle wont get hurt by trying an over power resistance. Feature: can help reduce arm fat, abdominal fat, and increase the gathering effect of the chest, it is a good product for reducing fat and weight and increase strength training. Suitable for: health and fitness is the most important, no matter professional or amateur, novice or veteran, young or old, male or female, bodybuilder or fitness exerciser, this hydraulic arm machine is always a perfect strength training choice. Description: Stable triangle center design makes the exercise more stable, which is a safer and more scientific structure. Professional micro-rebound and refuse to take profiteering rebound. Completely solve the safety hazard for safe fitness with no hurt and safe micro-rebound. The buckle of the handle's bottom is easy to store and convenient to carry. The user-friendly designed rear buckle can be fixed after folding. Specification: Material: spring steel Size: 42 x 17 x 5cm Colour: Black The Package Includes: 1 x main body 2 x holder 1 x manual