1,SMART COUNTING: Hand grippers are equipped with the latest counting function, which works a life time without a battery and will record your exerciser number every time. Helping you know the training progress better. (Press the button firmly to count automatically, and rotate the button to clear the digitals) 2,DURABLE MATERIAL: Hand grips for strength training, made of the latest upgraded material, have a longer handle than others, which is more convenient for you to hold. In addition, the handle material is strong and durable, which perfectly avoids the problem of the handle breaking during exercise! 3,PORTABLE AND CONVENIENT: Grip strength trainer is super portable and allows you to work out anywhere, home, car, office, and more! This lets you work out more, building muscle faster than ever. 4,ADJUSTABLE RESISTANCE: Grip strength trainer supports 5‑60KG strength adjustment, rotary adjustment to meet different people, it can exercise fingers and forearms. 5,THICKEN SPRING: Hand grip strengthener adopts 4mm thicken spring, strong force, durable and comfortable rebound. Anti‑slip handle, fit your fingers.Item Type: Grip Strength Trainer Material: PP, TPE, Spring Steel Product Specification: Black Gray Product Quantity: 2pcs2 x Grip Strength Trainer