1.PROFESSIONAL STANDARD The brand new Powerball Metal Grip Strengthener is a high quality, high standard product that will make you feel healthy, flexible and strong - always. Build up pressure, strengthen muscles and heal injuries: these solid metal grippers offer everything a powerful, compact device should have.2.FOR ALL FITNESS LEVELS With a choice of 2powerful resistance levels (100lbs, 150lbs, ), the metal pliers can be used at all levels of strength and fitness.3.INJURY TREATMENT & PREVENTION This metal strengthening device is effective for rehabilitation and strengthening. Start with low resistance grippers and gradually work your way through training levels as you get stronger and recover. Ideal to prevent like carpal tunnel syndrome, tendinitis, etc.4.ULTIMATE GRIP STRENGTH Build strength in arms and wrists for advanced workouts in the gym; improve your dexterity and train your muscles for ultimate grip strength - the new grip strengthener from offers everything you need for effective hand and wrist training.5.EASY TO USE Squeeze the struts together for a few seconds or alternately relax and tighten your grip for effective strengthening - you control the intensity of your exercise; just "go ahead and squeeze" for immediate effect.