Sram XX1 Eagle X-Glide 1299 Rainbow 12s 10-50T Cassette, with X-Dome technology creatly an incredibly lightweight, precise and strong cassette. XD driver body compatible. 360 gr. weight. 10,12,14,16,18,21,24,28,32,36,42,50T. "Rainbow" finishing to match Eagle AXS drivetrain.