It is a high precision casting,we use green wax(mid-temperature wax),usually produce some small but high tolerance and high quality parts. Max.size:300mm weight:0.02-25kg Tolerance:CT6-8 Roughness of the casting surface:Ra6.3-Ra25 Technic:open mould according to the drawings---Wax injection--mould shell making--lost wax--mould shell baking---pouring---sandblast--- machining---surface treatment. material: carbon steel, alloy steel, stainless steel,non-ferrous metal.