We humidifier filter, made of natural fabric, multi-layer mesh surface to maximize the output of humidifier moisture, but also better filter Limescale, the upgraded material makes the filter more stable and filtering, can be used for a longer time. Including for Relion WF813 RCM-832 RCM-832N,for Pro Care PCWF813 PCWF-813 PCCM-832N PCCM- 840,for Equate EQ-2119-UL,for Sesame Street SH100 & SH200,also compatible with for Duracraft / Robitussin humidifier models DH-830, DH-832, AC-813, ACR-832, D13-C, HC-832, etc. Easy Installation,Remove the old filter cartridge in your humidifier, put this brand humidifiers filters in its place and adjust it well. Normal use 1-3 months need to be replaced with distilled water or cold water to fill the tank, not hot water. Color: white Material: wood pulp paper Package Contents: 20 x Filter