Feature 1Premium carbon pre filter absorbs and eliminates any household unfavorable odor. 2For use with Holmes air purifier models: HAP2400, HAP242, HAP412, HAP422, HAP424, HAP1200, HAP706 or HAP716. 3Also works on purifier models BAP260, BAP815, BAP825, BAP1412, BAP1502, BAP1525, BAP1700 and BAP8500. 4Use with main HEPA filter for the purifier. A pack of 4 pre filters included. 5Absorbs or traps the odor to build a refreshing air environment for you.Specification Features: Premium carbon pre filter absorbs and eliminates any household unfavorable odor. For use with Holmes air purifier models: HAP2400, HAP242, HAP412, HAP422, HAP424, HAP1200, HAP706 or HAP716. Also works on purifier models BAP260, BAP815, BAP825, BAP1412, BAP1502, BAP1525, BAP1700 and BAP8500. Use with main HEPA filter for the purifier. A pack of 4 pre filters included. Absorbs or traps the odor to build a refreshing air environment for you. Specifications: Condition: 100% Brand New Main Material: Carbon sponge Color: Black Size: 24.3 x 10.5 cm / 9.57 x 4.13 inch (appr.) Package Included: 4 x Carbon Sponge Filters .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }