LOLTRA 8T 10T 11T 12T 13T 14T 15T 16T 17T Ceramic Bearing Alloy MTB Bicycle Rear Derailleur Pulley Jockey Wheel Road Bike Guide Roller(10T, Red) Go to amazon.com Related posts Best 10t pulley FeatureApply for:most of rear derailleur on the marketFit for:4/5/9 MM roller screw axisMaterial:aluminum alloy 7075Bearing:Ceramic BearingSize: 10T DescriptionDetails:Weight:about 7.8g