filters compatible for Honeywell replacement wicking Filter A for your Honeywell HAC-504, HAC-504AW, and HAC-504V1 humidifier filters.Upgraded Filters - Our upgraded filters compatible with for Honeywell HCM350W filter feature a pre-filter to catch large particles before they enter your air, for even higher air quality Rigid Construction To Reduce Sagging - Constructed with rigid absorbent paper to improve the filter's structure once wet and reduce saggingRigid Construction To Reduce Sagging - Constructed with rigid absorbent paper to improve the filter's structure once wet and reduce saggingUsage Tips - For best results, flip your compatible for Honeywell humidifier filter HAC 504 replacement daily and only fill humidifier tank with distilled water. Hard water degrades ALL compatible for Honeywell humidifier filters and yellows them prematurely. Soak in cool water before replacing to ensure uninterrupted moisture output.colour: white + blueMaterial: paperPackage Contents:2 x filter elementsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.