There is no need to buy a multi handle adjustable knob, which can be adjusted to 22 – 39.9 kilogram (10 – 40 kg), which can enhance physical strength over time; It is very suitable for wrists, fingers, arms and hands to improve strength and speed; Ergonomic design, suitable for all palm sizes of men, women, the elderly and teenagers, perfect; Anti slip handle, soft, comfortable, wear-resistant rubber, often used and comfortable