Carbon Pre-Filter 4-pack for Homedics AF-75FL 4-pack of Carbon Activated Pre-Filters Made in the USA from premium BulkFilter Brand filter material For use with HoMedics hypoallergenic HEPA Air Cleaners AF-75 and AR-10 Hepa Filter AF-75FL Carbon Activated filters extend the life of the hepa filter and remove common household odors Each Carbon Pre-Filter measures 9.5"x10.75"x.2"