Arnott's aftermarket replacement struts feature a heavy-duty Continental ContiTech air spring bladder and a shock custom-designed for the 7 Series with a larger piston to provide excellent ride quality and stability. Arnott assembles these new struts in the USA using the highest quality materials including a CNC-machined top mount and bottom air spring perch made of aircraft-quality aluminum, new crimping rings, O-rings, bump stop, an aluminum can, air fitting and protective dust boot. These all new struts turn off any dashboard suspension warning lights and come pre-assembled for an OE fit.