1) Frame: 12", steel
2) Fork:12",steel 3) Handlebar: Steel
4) Stem: Steel 5) Brakes: Steel, R/coster-brake 6) Chain wheel: Steel 1/2"x 1/8"x28T 7) Hub: Steel 8) Rim: Alloy 9) Tire: 12-1/2“ x 2-1/4"