Perfect Compatibility: High efficiency replacement filter suitable for I and E series vacuum cleaners: i7 i7+ i3 i3+ i4 i4+ i6 i6+ i8 i8+ E5 E6 E7. Always check your vacuum cleaner model before purchasing! High Quality: The replacement filters are made of high quality materials and are fully tested to meet original standards, with ultra-durable construction that will not break or wear out easily. For optimal performance, it is recommended to clean and replace the filter every 2 to 3 months. Easy to Install: These i3 i7 replacement filters are very easy to change and install on your vacuum cleaner. No tools are required, please cut off the power supply and wear gloves before installation. Simply remove and replace the I7 replacement filter from your machine as needed. You can save more time and energy. Value Pack: The package contains 12 pieces of I3 replacement filters; the i3 filter cannot be cleaned with water to avoid destroying the electrostatic attraction and affecting the adsorption effect. I3 high-efficiency replacement filters help capture 99.9% of dust, pet hair and small particles as small as 0.1 microns.