ITEM NAME:Muqzi Bicycle Ceramic Guide Pulley 7075 Aluminum Alloy Rear Derailleur 11T Z2Q3 Muqzi Bicycle Ceramic Guide Pulley 7075 Aluminum Alloy Rear Derailleur 11T Z2Q3 Product: Bicycle Rear Derailleur Pulley Jockey Wheel Structure:Ceramic Bearings Material:aluminum alloy size:11T Diameter:11T--41mm Color: Red Weight: 11T--7.5g/pcs Fit for 4/6 MM roller screw axis Apply for most of rear derailleur on the market, support 7/8/9/10 speed Tips: Please choose the same size with the original pulley. If no totally same, choose the smaller type, never choose the bigger than original ones. Package Contents: 1* Bicycle Guide Pulley 1* Axis