Accessory Kit for Irobot Roomba Vacuum Cleaner 500 530 550 560 Series Vacuum Cleaner Replacement kit for irobot 500 series (not include 585,550,595 or Aerovac) For best results, filters should be replaced every 2 - 3 months. Kit Includes 12pcs total 1pcs bristle brush, 1pcs flexible beater brush,2 pcs Cleaning Tool ,5pcs Filter Designed to meet or exceed the original qualitity