CeramicSpeed Pulley Wheel Description: CeramicSpeed pulley wheels reduce friction, last 3-5 time longer than stock high-end pulleys, and are designed to work with less drag. Features: Premium Grade 3 Silicon Nitride Ceramic balls Hand built in Denmark Precision machined aluminum narrow-wide pulleys Hardeneed Races 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 Specifications: Compatibility: SRAM AXS Road Speeds: 12 Speed Color: Black