Precision extruded body is made of anodized 6061-T6 aluminum Rust and rust resistant finish Mono-Tube design with additional moving piston provides excellent separation of oil from high-pressure compressed nitrogen Nitrile rubber bushings ensure quiet shock absorber operation Components made of anodized 6061-T6 machined aluminum Chrome-plated 5/8” piston rod of heat-treated steel Engineered for motorsports with high oil flow piston Extremely tight triple seal system: main seal, piston rod seal, scraper seal High-tech JM92 oil for superior performance regardless of temperature