Rated highly among physical therapists, fitness trainers, and caregivers alike, the Gripmaster is an ideal tool used for strengthening the muscles in the hand. Different weight resistance are assigned to each color. The different resistances available are: 1.5 lbs/finger (green), 3 lbs/finger (yellow), 5 lbs/finger (blue), 7 lbs/finger (red), 9 lbs/finger (black). The different resistance levels, reasonable price, and convenient size make it beneficial for everyone!