Features: * Anti-bacterial treated, traps minerals * For use with Bemis, Essick Air, Moist Air 300, 500, 700, DP3 and B23 Series Humidifiers * Metal reinforcement * Adds rigidity to shape of the wick filter when moistened * Also adds stability with today"s softer, more absorbent paper * Prevents "slumping" or "sagging" over time or when wet * Helps maintain the humidifier"s designed output What"s In The Box: * Bestair B40-C Humidifier Filter for Bemis/Essick Air - 2-Pack