RockShox Vivid/Kage Coil Spring, 350lb, 8.5"/ 8.75" x 2.75", Gray Coil springs are available in many sizes and weight ratings Each are available separately and are not included with Vivid and Kage aftermarket shocks I.D. (mm): 38 Spring Weight: 350 RockShox Vivid/Kage Rear Shock Springs