Contains Four (4) MD1-0034 Evaporative Humidifier Replacement Wicks | Compatible with Vornado Evaporative Humidifier Model: EV100, EV200, EVDC300, EVDC500, Evap2, and Evap40 (NOT for Evap3) | Captures mineral deposits from humidifier water tank and prevents white dust | Highest quality materials and superior performance, replace every 4-8 weeks for optimal performance, depending on use | Easy to replace, disposable, no tools required