CeramicSpeed pulley wheels reduce friction, last 3-5 time longer than stock high-end pulleys, and are designed to work with less drag. Premium Grade 3 Silicon Nitride Ceramic balls Hand built in Denmark Precision machined titanium narrow-wide pulleys have a lifetime three times greater than those made of machined aluminium Coated races increase bearing service life by increasing hardness of race and reducing corrosion Includes: (2) 12 tooth pulley wheels, Alloy Spacer Kit and CeramicSpeed Bearing Oil 15ml bottle Compatible with SRAM Red AXS, SRAM Force AXS, SRAM Rival AXS, please note these pulleys are not compatible with any XPLR derailleurs CeramicSpeed products with coated bearings include a 6-year warranty Specifications Drivetrain Speeds12Fits BrandSRAM