General description The 18PCS HEPA Filter Replacement Parts are designed for iRobot Roomba models I3, I3+, I4, I7, I7+, E5, E6, and E7. Made from high-quality materials, these filters enhance the vacuum's performance by effectively trapping dust, pollen, and other allergens, ensuring cleaner air in your home. Regular replacement of these filters is essential for maintaining optimal functionality. Technical specifications Material: Plastic Package Contents: 18 x Filters Recommended Replacement Frequency: Every 2 to 3 months Measurement Allowed Error: +/- 1-3 cm Usage Easy to disassemble and replace as part of routine maintenance. Helps keep the robot vacuum running at peak performance.