If you&';re looking to increase or decrease the travel in your 2018+ Fox Float 34 Rhythm or Marzocchi Bomber Z2 fork, then just snag an air shaft and swap it out in your fork! Fits Fox 34 Rhythm & Marzocchi Bomber Z2 forks. Includes brand new seals pre-installed, plus a new spring retainer clip. *NOTE* - This air shaft is not compatible with a standard Fox 34 or an e-optimized Bomber Z2.