A. Easy to carry and use: This handheld device is lightweight and easy to carry, with less restriction by time and space. Press the spacers together for a few seconds, or alternately relax and strengthen your grip to effectively enhance strength. You can control the intensity of the training. It is suitable for people of various ages and athletes. B. Increase hand flexibility: By using this forearm trainer, your hand muscles will be exercised and blood circulation will also be accelerated. It helps to increase the flexibility of fingers, palms and wrists, and may prevent arthritis. C. Metal material: Metal grip strengtheners can be effective for rehabilitation and strength enhancement. Different colors are used to distinguish the resistance levels, namely: ribbon color (100 lbs), blue (150 lbs), red (200 lbs), yellow (250 lbs), black (300 lbs). D. Treat and prevent injuries: This support device is suitable for preventing repetitive strain injuries (RSIs), such as carpal tunnel syndrome, tendonitis, etc.