Features: Fit for building wrist,forearm strength Fit for climbers, martial artists, athletes and anyone who wants to improve their hand strength By increasing the resistance,it will eventually allow you to build hand strength. Works great for increasing speed, strength and power in the wrist, hands, fingers and forearms. Excellent recovery & rehabilitation tool for arthritis, carpel tunnel, rheumatoid arthritis, tendinitis, post surgery, tennis elbow, wrist sprains and broken fingers or wrists. Ergonomic & ambidextrous design makes it suitable for men women, seniors, teens and pre-teens, and children, depending on age. Description: Material: Aluminum & iron Color: Silver Size: As the picture show Type:100lbs /150lbs /200lbs / 250lbs / 300lbs Strength: 45kg5 / 67kg5 / 90kg5 / 112kg5 / 135kg5 Package included: 1pc x (100lbs /150lbs /200lbs / 250lbs / 300lbs) Fitness Heavy Grips + A pair of foam sleeves + 1 piece of Oxford cloth bag. Note: 1.There could be some slight differences in the color tone of the pictures and the actual item. 2.Please allow 1-2mm differs due to manual measurement, thanks.