Filter for Karcher WD2 WD3 MV2 MV3 robot vacuum cleaner.The filter can maintain the cleaning performance of for Roomba while reducing the penetration of dust, pollen and other allergens in the air you breatheFor best results, the filter should be replaced every 1-3 months.The cartridge filter elements has the function of dust isolation and dust filtering, preventing dust from entering the motor room and extending the service life of the motorWashable and reusablesize:11.5x12.1cmMaterial:plasticcolour:YellowPackage Contents:3 x Filter elementsOnly 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.