6 Filters - 2 Complete Sets - Air Purifier Set of Filters to fit ALL Blueair 500 and 600 Series ; By LifeSupplyUSA 2 Complete Sets of Filter Changes - 6 Filters Will fit: Blueair 501, 503, 550E, 601, 603, 650E models and ALL Blueair 500 & 600 Series Air Purifiers Carbon Filters combined with True HEPA filter Essential for households with Children, Seniors, Pets, Allergy and Asthma sufferers and smokers Brand New, Sealed - By LifeSupplyUSA