1.Chrome:white 2.Nitriding process :black 3.Entire material valves, double metal friction welding 4.Small soldering terminal pin, small soldering alloy 5.Shaft chromium-plating , surfacing nitration treatment. Neutral packing, White bag, white box, carton. One bag includes one pc engine valve, one box includes 4 pcs engine valves, one carton includes 50 boxes. 20'' container includes 1000 cartons
