Frame:12" steel,T/T:38mm,D/T:42mm,S/T:28.6mm Fork:steel,32mm Head parts:Steel B.B. Parts:Steel and one piece crank Brake:Rea 12 bicycle Frame:12" steel,T/T:38mm,D/T:42mm,S/T:28.6mm Fork:steel,32mmHead parts:Steel B.B. Parts:Steel and one piece crankBrake:Rear coaster brakeTire:Air tire,12*2.125Rim:Steel,16H