We humidifier filter, made of natural fabric, multi-layer mesh surface to maximize the output of humidifier moisture, also better filter Limescale, the new upgraded aluminum foil material makes the filter more stable and filtering, can be used for a time.Including for Relion WF813 RCM-832 RCM-832N,for Pro Care PCWF813 PCWF-813 PCCM-832N PCCM- 840,for EQ-2119-UL,for SH100 & SH200,also compatible with for / Robitussin humidifier models -830, -832, AC-813, ACR-832, D13-C, -832, etc.Easy Installation,Remove the old filter cartridge in your humidifier, put this brand new humidifiers in place and adjust it . Normal use 1-3 months need to be replaced with distilled water or cold water to fill the tank, not hot water.Colour:WhiteMaterial:Wood pulp paperPackage Contents:4 x Humidifier FilterOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.