2-Pack of Premium Quality HEPA Filters Plus 8 Carbon Replacement Filters Compatible with Winix Filter A 115115 Size 21 2 HEPA filter and 8 Carbon pre-filters included for odor reduction Compatible with Winix plasma wave air cleaner models WAC5300, WAC5500, WAC6300, 5000, 5000b, 5300, 5500, 6300 & 9000 Activated Carbon Filter They are Compatible with Winix plasma wave air cleaner models WAC5300, WAC5500, WAC6300, 5000, 5000b, 5300, 5500, 6300, AM90 & 9000.