Stealth Ring elastomers to reduce noise and vibration.To suit SRAM XG-1090 X-Dome cassettes, ratio 11-23T, 11-25/26T & 11-28T.FeaturesFull cassette cog spacer kit for SRAM RED XG-1090 11-23T, 25/26T & 11-28T.Stealth elastomer rings sit between the cogs...