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The Cortex dispenses with the balls and springs typical to freecoasters and replaces them with a coil spring and polymer ring, offering smoother operation and much longer life.Features-6061-T6 alloy hub-shell-Hardened heat-treated crmo axle-2 high quality sealed bearings-Driver features 2 high quality bearings and a bushing for extra support-Large slack setting pre-installed-Allen key inner axle for easy maintenance-Adjustable slack-Includes Viper nylon hub guard and Gong driver guardItem Specifications-Color:High Polished-Defined Color:Silver-Hub Type:Rear Freecoaster-Axle Size:14mm-Axle Type:Male-Hub Drilling:36-Spoke Interface:J-Bend-Cassette Body Type:Single Cog Driver-Tooth Count:9