The SRAM X7 9-Speed Rear Derailleur uses SRAM's Exact Actuation technology for precise & dependable 9-speed performance. With a 3K carbon outer cage the X7 borrows the high quality materials of it's more luxurious X9 & X0 compatriots but at a fraction of the cost. With the flexibility of three different cage lengths & weighing in at only 239 grams the SRAM X7 rear derailleur is shifting componentry at it's most versatile & most importantly, affordable.