Specifications Brand GUBMaterial Aluminum alloyColor Black Blue Red Gold TitaniumNet weight 11gType 11TSize Show as the picturesFeatures Support for 7 8 9 10 Speed Shaft core diameter of 6mm can be used to convert units to be compatible with 4mm and 5mm screws of the guide wheel Guide wheel selection principles try to use the same size as original guide wheel if not the same you can choose small size than the original guide but can not use large Package includes 1 x Bicycle Derailleur