This product come from Henan BEBON international co., ltd in CHINA. http: / / www.bebonchina.com Email: bill@ bebonchina.com Manufacturing technique: silicasol and water glass technique. Process flows: making moulds— injecting wax---organizing----case forming---shaping---dewaxing----pouring---cleaning by being hung---machining Standard: ASTM, DIN, JIS, ISO… Min unit weight : 0.1 kg Material of casting : carbon steel, alloy steel, stainless steel , brass… ..