1. Compatibility: For Kärcher WD1, WD2, WD 2 Premium, WD3P, WD3 Premium, WD 3200, WD 3230, WD 3500, SE 4001, SE 4002, MV 2, MV 3, MV3P, A 2004, A 2054 ME, A 2101, A 2120, A 2204, A 2254, A 2604, A 2654, K 2150, KNT 2 Premium cartridge filters. 2. Material: With HEPA filter paper and meltblown fabric, the product is made of original size high-density ABS material. Dense blow-molded fabric and HEPA filter paper with activated carbon particles eliminate specific odors. Activated carbon particles eliminate specific odors, purify the air and adsorb harmful substances. The suction power is stronger and the motor does not overheat due to good air permeability, thus prolonging the life of the vacuum cleaner. 3. Filter: The H12 Hepa filter made of environmentally friendly materials removes 99.98% of dust, hair and small debris down to 0.3 µm (0.00003 mm). Deep clean your home 4. Easy to use and install: simple installation and long service life. It can be replaced in seconds without having to touch the dirt. These vacuum cleaner parts can be washed and reused. It is recommended that you hoover every 3 months for optimal performance, especially in homes with children, pets or smokers. 5.Product type : Set of 2 filters with closing clip and fixing screw.