B3-Pack Filter for iRobot Roomba 500 Series Vacuum Cleaning Robots and Roomba Professional Series Robots. ReviewbP PP 3-Pack Filter for iRobot Roomba 500 Series Vacuum Cleaning Robots and Roomba Professional Series Robots. PPackage contains 3 filters.PFor use with iRobot Roomba 500 Series Vacuum Cleaning Robots and Roomba Professional Series Robots.PFilters maintain optimal cleaning performance.PFilters reduce infiltration of dust, pollen and other allergens.PPart Number: VP-RM500-3FLT.