Value Pack - Premium replacement for HFT600 Filter T filters for your HEV615 and HEV620 humidifiers. Made from , durable material with an upgraded filter design to both filter particles and maximize moisture output Upgraded Blue Pre-Filter Layer - Our premium upgraded blue layer pre-filter helps reduce the quantity of particles circulating in your Compatible With for Humidifier Filters Replacement Filters - Compatible with HTF600 Filter and Filter T. Precision designed and manufactured for humidifier models HEV615 and 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 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 x 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.