https://www.irobot.com/en_US/premium-air-purifiers/aair-3-in-1-pro-filter-replacement/4816163.html

Condition: Brand new, unopened box
Reason for sale: Bought extra during a sale but no longer need it
Description: High-performance replacement filter for the iRobot aair 3-in-1 Pro Air Purifier. Perfect for keeping your air clean and fresh!