CIMC LLC For iRobot Roomba 4100 Vacuum Cleaner Accessory Kit Roomba 400 Series Accessory Kit - Replacement - Includes 2X Side Brush & 2X Filter Compatible with: iRobot Roomba 400 Series 405 4110 4150 4910 Vacuum Cleaner More strength and surface area than standard filters which is the best choose for homes with pets and allergy sensitivities. Replace filters every 1-2 months for peak performance. Package includes: 2 sits 400 series filter and side brush.