feature - Control the collapsing stroke of the shock absorber in the slow collapsing stroke, adjustable 30 levels (Compression Adjustable) - Adjust the viscosity in the return stroke of the shock absorber to slow or fast as required (Rebound Adjustable) - Adjust the spring stiffness in relation to the rider's weight (Threaded spring preload) - Adjust the length of the shock absorber by 5 mm (Length Adjustable)