SRAM XG-1190 Cassette (RED 22)SRAM XG 1190 CASSETTE (RED 22) The SRAM RED 22 Powerdome X is the most advanced cassette ever made. Super light, deadly silent, and precise. The nine cogs in the middle are machined from a single block of high grade tool steel, increasing stiffness while weighing less than a titanium cassette. Between each cog in the block sits a StealthRing elastomer to reduce vibration and noise. Cut outs on the rear cog further reduce weight and add stiffness. And