The internal structure of the shock absorber features two - way damping and two - way air pressure. In a two - way shock absorber, when the vehicle body is pressing down during driving, the shock absorber provides resistance to prevent it from bottoming out. When the vehicle body rebounds, the shock absorber exerts a pulling force to stop it from bouncing back directly. The overall shock - absorbing effect is much better than that of the original shock absorbers, and the stability is also significantly improved. It has 10 levels of adjustability for softness and firmness. You can make it 40% - 50% softer or 40% - 50% firmer compared to the original settings, which is extremely flexible and convenient.