2 peice, heat treated 4130 chromoly 100 percent heat treated after welding for superior strength 3 wall thicknesses for unparallelled rigidity 11 butted technology Tig welder construction 19mm Crossbar 7/8` 29` 9.25` 2? 11? Black BMX 4130 CrMoUPC/EAN/GTIN: 888571039762