2 piece, heat treated 4130 Chromoly construction 100 percent heat treated after welding for superior strength 3 wall thickness for unparelleled rigidity 11 butted technology Tig welded construction 19mm crossbar 7/8` 29` 9` 2? 11? Blue Nickle BMX 4130 CrMoUPC/EAN/GTIN: 888571039748