This is a cosmetic By-Pass shock sleeve specific to the RC4WD KING 120mm shocks. Designed to be used on a 1/10 scale Axial RR10 bomber (But feel free to experiment with other rigs!). Simply slides over shock barrel and is held in place by friction (could use some glue if you want to, nothing to hard though). This sleeve will be available in several materials, The least expensive material will require finishing techniques and paint to produce a smooth metal finish. There is a passenger and driver side available, But you can put them on which ever side you want.