OEM replacement with performance characteristics NEW 35mm performance compression valve, NEW Performance rebound valve design, NEW 30mm piston with low friction piston Teflon seal 45mm wide body for increased oil volume and cavitation free valve train avoids air from decreasing the shock absorbers effectiveness Hardened Chrome 12. 5mm piston rod with Triple lip NBR rod seal utilizing a Teflon guide bushing Dust boots and OE style rubber bushings offers maximum durability