1、Natural Latex Tension Tube: Soft and anti aging, tough and durable, non general latex, external high density nylon protective cover, anti stretch and anti oxidation, effectively avoid rebound injury. 2、Electrophoresis Sawtooth Buckle: The more you pull, the tighter it will not fall off, and it is sturdy and durable. High quality quick release buckle, accurate rebound, easy to use. 3、ABS Buckle: Firm and wear resistant, and the tension tube is detachable to meet the exercise needs of different groups of people. Comes with a thick protective cover, stable and safe to use. 4、Applicable People: Perfect for fitness pros and beginners. If you're having a hard time doing jaw training or can't maintain the same energy as you do pull ups, it'll help make it easier for you. 5、Adjustable Webbing Length: The length of the webbing can be adjusted at will, which is strong and durable, allowing you to exercise as you like. Suitable for home and gym.