Precision engineered with G-Force technology for the ultimate in safety and performance, Working tube made of SteelPro™ alloy steel to provide superior strength, toughness and impact resistance while maintaining unmatched ductility, Surface-treated provides abrasive and contaminant protection while preventing rust, Piston rods made of S45C medium carbon steel for precision and wear resistance. Hard chrome plating process ensure extended durability of the rod, Reinforced piston provides optimal tube pressure control and resistance for increase ride quality, OE fluid contains special additives to perform among extreme temperatures and helps reduce oil breakdown, Professional grade fluid seal reduces excessive friction and increase longevity by preventing premature leaks, Nitrogen gas charge maintains road contact for enhanced ride and handling by reducing aeration and shock fade, Premium hardened mount following OE spec for easy installation. SAE-Grade bolt and nuts, Part Reference Numbers : 346325 346348 349137 3430019 5527 5C0 413 031 BL 5C0 413 031 BN 5C0413031AF 5C0413031CS 5C0413031T 5C0513025AE 5C0513025Q 5C0513029AA 5C0513029AB 5C0513029AG 5C0513029J 5C0513029R 257160