The all-new Ramp Control PRO upgrade cartridges pair MRP's acclaimed Ramp Control technology with traditional air-spring volume adjustment. Ramp Control PRO cartridges feature a threaded bottom which interfaces with MRP's Huck Puck volume spacers - also found in the Bartlett, Raven, and Ribbon SL forks. Air volume tuning allows you to dictate the baseline air-spring curve and Ramp Control provides a powerful way to control high-speed and ending-stroke performance. Together, it's a robust package that puts you in precise control of your air-spring performance quickly and easily.