Riders asked for a shock that bridged the gap between Super Deluxe and Vivid. The Linear XL air can is the answer. With an increase in positive air volume, Linear XL is a ringer for a coil with super supple action at the top of the travel.Compatible with RockShox rear shock models: RS-SIDL-STFA-A2, RS-SIDL-STFA-A3, RS-SIDL-UFA-A2, RS-SIDL-UFA-A3, RS-SIDL-ULT-A1, RS-SIDL-ULT2-A2, RS-SIDL-ULT3-A2Improved air without sacrificing tunabilityRoom for 8 bottomless tokens (four in the eyelet and four on theair sleeve), the air volume can be adjusted to fine-tune feel RockShox Linear XL Air Can Upgrade Kit Rear Shock Part UPC: 710845930331