Features:High quality of materials.This roller is an accessory for bicycle derailleur.It is universal and suitable for majority of 10-tooth rear derailleur.Durable,useful,lightweight.1 pc of roller only,other accessories demo in the picture are not included!Specification:Material: PlasticType: 10-toothColor: Black,RedSize: One SizeDiameter: 1.2cm(0.47in)Quantity: 1 PcNote:1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package includes(without retail package):1 x Roller