1.malleable iron 2.beaded and banded 3.light series and heavy series ... pipe fitting and come from our factory All Kinds Malleable Iron Pipe FittingMaterial: malleable ironSize:1/2''--6''Side: beaded or bandedGrade: light ... ,banded elbow, tee, nipple, socket, cap, plug, nut, flange, union, bushing, cross,welding pipe fitting,carbon steelEvery product pass serious test ...