Frame:12" steel,T/T:38mm,D/T:38*74mm, S/T:28mm Fork:steel,28mm Head parts:Steel B.B. Parts:Steel and three pieces crank,cotte bicycle kid's bike Frame:12" steel,T/T:38mm,D/T:38*74mm, S/T:28mmFork:steel,28mmHead parts:SteelB.B. Parts:Steel and three pieces crank,cotter-pinBrake:Front and rear caliper brakeTire:Air tire,12*2.125Rim:Steel,16H