Filters maintain Roomba's cleaning performance while reducing infiltration of dust, pollen and other allergens into the air you breathe.Often replace the filter to help make indoor air more freshFilter helps reduce household odorsThey are perfect fit and easy to install. Recommend to replace the filter every 2-3 months and shorten the replacement time if you have pets.Made of high-quality materials, strong and durable.When the cleaner is working, the roller brush will adjust the rotation and clean the floor.Compatible models:Suitable for Xiaomi Viomi SE V2 V2PRO V-RVCLM21B V3Name: Vacuum-Mop accessoriesColour:blueMaterial:plasticPackage Contents:2 * Main brush4 * Filter4 * Side brush1 * Cleaning toolOnly the above package content, other products are not included.Note: Light shooting 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.