A twin-tube shock absorber is equipped with the hard-chromed piston rod, the multi-stage rebound/compression vales, the seamless end eye-ring and the high quality rubber bushes. The selected materials and the state-of-the-art technologies ensure siberia twin-tube to provide passenger stable, comfortable and safe ride experience. Siberia gas-charged twin-tube shock absorbers provide passengers even better ride experience as the pressurized nitrogen gas reduces the air bubbing/foaming that commonly impairs the shock absorber performance.