Specification Brand : VGEBY BulletPoint1 : TOP QUALITY: Rear Derailleur Pulley is made of aluminum alloy, which is wear-resistant, anti-rust and lightweight. BulletPoint2 : GOOD PERFORMANCE: Steel bearing is high strength and smooth, which ensures fast and sensitive working, quite useful and practical. BulletPoint3 : Solid casting and fine machining, anti-rust and resistance, for long time use. BulletPoint4 : GREAT COMPATIBILITY: Comes with a 4mm and 5mm adapters, suitable for various bikes. By the way, 12T is compatible with the most, support for 9/10/11 speed bikes. BulletPoint5 : GUARANTEE: If you are not satisfied with our product received, you can apply for unconditional return and refund within 180 days. In terms of any problem of this product, you can send emails as soon. Color : as picture shown ExternallyAssignedProductIdentifier1 : 753874811509 ExternallyAssignedProductIdentifier2 : 0753874811509 ItemDisplayDimensions_Height : 1 inches ItemDisplayDimensions_Length : 2.25 inches ItemDisplayDimensions_Width : 1.5 inches ItemDisplayWeight : 2.85 pounds ItemName : VGEBY1 Rear Derailleur Pulley, Rear Derailleur Wheel 12T Mountain Bike Bearing Pulley Set Parts(Red) ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 8 centimeters ItemPackageDimensions_Width : 6 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : rear-bike-derailleurs LeagueName : Wheels Manufacturing Manufacturer : Wheels Manufacturing Material : Aluminum MountingType : Braze-On Mount NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : VGEBYisypb92eng-02 ProductDescription : Features: TOP QUALITY: Rear Derailleur Pulley is made of aluminum alloy, which is wear-resistant, anti-rust and lightweight. GOOD PERFORMANCE: Steel bearing is high strength and smooth, which ensures fast and sensitive working, quite useful and practical. Solid casting and fine machining, anti-rust and resistance, for long time use. GREAT COMPATIBILITY: Comes with a 4mm and 5mm adapters, suitable for various bikes. By the way, 12T is compatible with the most, support for 9/10/11 speed bikes.