Hamilton Beach Carbon Pre-Filter 4-Pack for True Air 04383, True Air Glow Allergen Reducer 04385, TrueAir Compact Pet Air Purifier 04384 4-Pack of pre-filters Designed to Fit True Air Air Purifier 04383, True Air Glow Allergen Reducer 04385, TrueAir Compact Pet Air Purifier 04384 Designed for use with Hepa filter part #990051000 High Quality Carbon filter material Made in the USA Aftermarket product meets or exceeds OEM specs