Value Pack - Premium replacement for HFT600 Filter T filters for your HEV615 & HEV620 humidifiers. Made from high-quality, material with an upgraded filter design to both filter large particles and maximize moisture output Upgraded Blue Pre-Filter Layer - Our premium upgraded blue layer pre-filter helps reduce the quantity of large particles circulating in your air Compatible With for Humidifier Filters Replacement Filters - Compatible with HTF600 Filter & Filter T. Precision designed and manufactured for humidifier models HEV615 & HEV620 Tips For Daily Use - For best results, flip your compatible for humidifier T filter daily and only fill humidifier tank with distilled water (this applies to all of filters). Hard water degrades ALL compatible for humidifier filters and yellows them prematurely Installation Instructions - Soak your replacement wick for T Filter for humidifier HEV615 and HEV620 in cool water before replacing to uninterrupted moisture output. Place in filter housing with blue layer facing outwards (towards you) Material:wood pulp paper colour:Blue Package Contents: 4 * filter elements Only the above package content, other products are not included. Note: Light 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.