1. A great way to reduce negative reactions and improve air quality in your home. HEPA Filter captures up to 99.97% of particles as small as 0.3 Micrometre from the air, including smoke, dust, pet hair and dander, and other airborne contaminants. 2. Pre-filter eliminates common household odors including smoke, cooking, pet odors, VOCs and captures airborne particles before they reach the HEPA filter. Freshens the air and helps the HEPA filter last longer. 3. Compatible with for parts 1183054K & 8171434K ( size); Compatible with for Whispure AP51030K, AP45030K, WP500 series, WP1000 series, APR45130L air purifier models; 4. This true HEPA filter captures up to 99.97% of airborne particles as small as 0.3 Micrometre, including household dust, pet dander, tobacco smoke, fabric fibers and more. The pre-filter eliminates common factors caused by pets, smoking and cooking, extending the life of the HEPA filter. 5. For best performance, replace HEPA filter every 12 months based on usage; pre-filter every 3 months Colour: Material:Plastic+pet filter paper Package Contents: 1 * Filter screen 4 * filter sponge Only 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.