Product Name: Tail Hook CorrectorMaterial: aluminum alloyWeight: about 720gApplication: 20-29 inch diameter wheelsFunction: used for proofreading and correction of bicycle tail hookProduct Name: Tail Hook CorrectorMaterial: aluminum alloyWeight: about 720gApplication: 20-29 inch diameter wheelsFunction: used for proofreading and correction of bicycle tail hookPacking list: tail hook orthosis *1