Carbon steel: A234 wpb,,, API 5L GR B, API 5L X42, API 5L X52, API 5L X60, API 5L X65, API 5L X70 and so on. 5. Surface: Black painting or color painting for carbon steel and alloy steel fittings 6. 8" and bellow size will packed by plywood case. 10" and above size will packed by plywood pallet 7.