Updated design for smoother and faster shifting More gradual gear progression between cogs - at least five one-tooth jumps - while still offering a wider range Designed to work with an XDR driver body One-piece machined steel X-Dome design for weight savings 10-28t 12s 10,11,12,13,14,15,16,17,19,21,24,28 Silver/Grey XG-1290UPC/EAN/GTIN: 710845822742