1. ULTIMATE GRIP STRENGTH Strengthens arms and wrists for in-depth workouts at the gym; train your muscles for better grip strength or re-educate your upper limbs after injuries - the new ALL-METAL Grip Strengthener (Grip Strengthener) from Powerball gives you everything you need, all in one product powerful and compact.^ 2. FOR ALL LEVELS With resistance levels possible, there is a Metal Gripper Powerball that is suitable for all levels of strength and fitness.^ 3. TREAT AND PREVENT INJURIES These Metal Strengtheners are very effective for both rehabilitation and muscle building. Start with a low resistance Gripper and level up as you get stronger and heal. It is the ideal product to prevent (Musculoskeletal disorders caused by repeated movements) such as carpal tunnel syndrome, tendonitis, etc.^ 4. EASY TO USE Squeeze the bars for a few seconds each time or release and tighten for concentric and eccentric strengthening - you control the intensity of your workout; just squeeze with your fingers for immediate effect.^ 5. PROFESSIONAL QUALITY Stainless steel springs and aluminum handles with diamond engravings for better grip. Plus, each comes with a comprehensive workout guide to help you maximize your strength training and rehabilitation results.^