RockShox Reverb Stealth IFP Description: These are the factory replacement IFPs for RockShox Reverb AXS and Reverb Stealth dropper seatposts. The IFP separates the oil and air on the inside of a dropper post, and assists in the smooth operation of the seatpost. Whether you are frequently performing routine service of a dropper post or have an IFP that has become damaged, this kit will make sure you will have the spare parts to take care of your dropper seatpost. Features: Original replacement parts for RockShox Reverb AXS and Reverb Stealth dropper seatposts This kit includes 10 separate IFP's