Type of material: Mild steel, Uncoated Steel. (Engine not included) Please see photos for all details! Note:This header does not have any kind of paint. -Comes with stainless steel hardware. This been tested on Tecumseh POWER SPORT 5.0hp, 6.0hp, 6.5hp (no tested on other engine) (Please see photos for Exhaust flange details) it may work on some B&S engines too. Good for: Mini bikes, go karts, generators... multipurpose.