1.Reinforced Mesh Paper 2.COMPATIBLE MODELS - Our wf813 humudifier filter replacement for Equate EQWF813, EQ 2119-UL; Replacement for WF813, RCM832, RCM832N, DH832, DH830; Replacement for RWF813, PCWF813, PCCM832N, AC813, PCCM-840; Replacement for Duracraft DH-830; Replacement for Robitusin DH-832, ACR-832, D13-C, HC-832; Replacement for Sesame Street SH100 & SH200. (Contact us if you are not clear the models, and we are here to help within 24 hours) 3.SUPER CRAFT - Our upgraded eqwf813 humidifier filter replacement with the hot glue strips and dense construction is made from high-quality reinforced mesh paper and adopts advanced lower density structure technology verified by the manufacturer, identical to the original, with higher efficiency, less pressure. In addition, our wf813 humidifier filters selected high quality materials can increase the use time of the filter and bring you a y life guarantee 4.EXCELLENT PERFORMENCE - ①Our wf813 humidifier replacement filter can successfully filters impurities in the water and retain the mineral elements needed by the human body. While humidifying the air, it relieves the discomfort caused by the dry environment. ②Prevents white powder from entering the room air and depositing on everything in sight. We aim to create a y and comfortable environment for those who want to breathe fresh air and meet the demand of your daily life 5.GREAT VALUE - 4 x WF813 humidifier filter replacement. Filter Dimension: H: 7.87' x L: 6.1' x W: 1.57'. Warm Tips: For results, please fill the humidifier tank with distilled water. Excessive use of hard water will degrade filters and cause them to turn yellow prematurely. We recommend you to replace the cool mist humidifier filter for vicks every 3-6 months for optimal performance (depending upon your usage)