1)Inconel base housing for high temperature and high pressure applications 2)Stainless steel t347 alloy valves for ultra strength 3)Billet 6061 aluminum cnc computer machined housing 4)Fully sealed shaft with 12mm thick welded flanges 5)High temperature and high pressure reinforced actuator diaphragm 6)Tested under extreme race conditions 7)Weld-on flanges are included with each kit 8)3 sets of springs are included for mild to high performance turbo systems 9)Year manufacturer warranty against deffects Material: aluminum and stainless steel