The pre filters are recommended to be replaced every 3-4 months. HEPA filters every 6 months for continuous cleaning performance.The vacuum filter replacement is made of high-strength materials, ensuring long-lasting reliability, keeping your home clean and greatly improving the air quality in your home.It is easy to be replaced and installed on your vacuum cleaner, just remove the old filter and install the new filter in place.These replacement filters can washable and reusable, simply rinse with clean water and let it completely air dry before reusing them.Colour:Photo ColorMaterial:plasticPackage Contents:2 x Pre-filter1 x Post-filterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.