Brand Name:Sram Type:Rear Derailleur Total Capacity:11-50T Components:Derailleurs Gears:12 Speed Model Number:SX Eagle Material:Alloy kit includes: 1.SRAM SX EAGLE 12 speed right trigger shifter.x1 2.SRAM SX EAGLE 12 speedlong cagerear derailleur. x1 3.SRAM SX EAGLE 12 speed PG-1210cassette 11-50T. x1 4.SRAM SX EAGLE 12 speed chain 126links . x1