steel frame&fork ,ED blk handle bar&stem ,ED saddle stem , alloy quick release, alloy F/R V-brake FRAME: 16 FREESTYLE STEEL FORK: 16 STEEL RIM: 16 ALLOY OPC RIM&HUBTIRE: 16*3.0 REVOLVER : STEEL 22.2 ED FOR FREESTYLE ,30MM CAP OPC CHAINWHEEL&CRANK ED BMX BICYCLE