Adjustable Hand Strengthener- From 5kg to 60kg, you can adjust its resistance to suit your level; take it slow and then go hard on yourself, increase the resistance as your strength develops. High quality and durable- Our grip strength trainer is made of heavy-duty plastic and reinforced metal alloy materials, unlike our competitors, which will break or even be made of low-quality materials. Durable and safe, it will not damage your hands and fingers, which will bring you an excellent user experience. Portable- Grip strength trainer is easy to clean and store, the lightweight design of the handgrip makes it ideal to pop into your bag for use whilst out and about. You can train your forearms, hands, wrists and fingers no matter where you are. Comfortable Handle- Ergonomic and soft handle of hand grips strengthener covered with TPR, which is relatively soft and won't hurt fingers, make the hand grip comfortable to hold. Fit for small and large size of hands, seniors and teenagers. 2 packs &Multifunctional- With 2 Packs , you could train your two hand at same time. This hand strengthener is ideal for rock climbers, bodybuilders, muscle builders, tennis players, drummers, guitarists, pianists, and massage therapists, improving the flexibility and power of fingers and wrists. It is also helpful in the recovery of injured hands.