ITEM NAME:1Set 11T Bike Ultralight Aluminum Alloy Outdoor Bearing Wheel Rear Deraille E4F2 1Set 11T Bike Ultralight Aluminum Alloy Outdoor Bearing Wheel Rear Deraille E4F2 Product Description Color: Red Material: Aluminum Alloy Size: Diameter 8.8MM Diameter 43.4MM Thickness 0.6CM; Cap hole size 0.5CM Rear screw gear hole 8.9MM Package Contents: 1Set x Bicycle Guide Wheel 1.Anodised CNC machined bicycle jockey wheel with fully sealed bearing for center bolt derailleurs. 2.Made a big difference to shifting, went from crunching to super smooth changes they almost step between gears now. 3.High quality precision CNC job with anodizing , lightweight and durable. 4.Excellent jockey wheel pulley. Smooth bearings. 5.Fits for almost all mountain bike of 11T..Fits for almost all mountain bike of 11T. 1Set x Bicycle Guide Wheel. Anodised CNC machined bicycle jockey wheel with fully sealed bearing for center bolt derailleurs. Excellent jockey wheel pulley.