4 Adjustable Resistance Levels, Meet Your Multiple Training Requirements: Providing 4 adjustable resistance levels ( 40-60-80-100 Lbs ) , grip strengthener can match your various grip training and solve your problem of hand, fingers and forearm. Compared with most of grip trainer on the market, hand grips are noiseless and do not squeak. Adopting a knob to adjust the strength, it is easy to adjust and more fluent.^ Durable and Sturdy, Hard To BreakErgonomic aluminium handles with diamond design for a non-slip grip, is durable and not easy to rust. Premium steel spring makes the forearm grippers construction more firm and sturdy. In addition, our hand grip exerciser strengthener comes with a pair of NBR Protective gloves, your training will become more comfortable. Its perfect for musician, guitar, athlete, golfer, rock climber, tennis player, and office worker.^ Easy To Carry, Exercise Anywhere AnytimePortable and lightweight design ( 6.1 inch, 0.47 lb), easy to pop into your pocket or backpack, you can take these hand grippers with you and exercise everywhere you go. Use them at home, at the office or when traveling, turning your downtime into a productive workout session.^ Great For Enhancing Hand Strength Rehabilitation: Targeting your forearms, hand, fingers and wrists, these strength training hand strengtheners provide the perfect way for building up hand strength and increasing your grip. hand gripper strengthener also work great for rehabilitation and stress relief, if you suffer from muscles bone stiffness, rheumatoid arthritis, and are on the way of recovery from a fractured or broken wrist, or tendon surgery.^ Professional After-Sale Customer Serviceis committed to building a professional fitness brand. If you have any questions on the usage of the products, you can access to our after-sale customer service 24/7 and we will offer you any help you need.