HIGH QUALITY - Vacuum cleaner to use with high quality kraft paper and polypropylene filter membrane for better protection of the vacuum cleaner. Paper filters for a thicker on the cardboard to prevent them from softening. are durable and sturdy, saving you worry and money. APPLICABLE MODELS - The 6.959-130.0 vacuum cleaner filters are compatible with A 2201,A 2204,A 2204 AF,A 2206 X,A 2236 X pt,A 2251 Me F1, A 2254 Me, A 2534 pt, A 2554 Me, A 2 Me, A 604, A 2654 Me, A 2656 X Plus, WD3,MV3,SE 4001,SE 4002,WD 3.150,WD 3.200,WD 3.230,WD 3.250,WD 3.300,WD 3.300 M,WD 3.310,WD 3.370,WD 3.500,WD 3.500 P,WD 3.5000 40,WD 3.600,WD 3.800,A 2231 PT. DOUBLE FILTRATION - The wd3 paper filter bag has a double density structure that can effectively inhibit the survival of bacteria, and the dust filtration rate is much higher than that of the cloth bag. bag can also prevent large dust particles from entering the motor compartment and damaging the motor, thus extending the service life of the vacuum