Features: * Anti-bacterial treated, traps minerals * Replacement filter fits Honeywell, Kaz, Vicks, and Robitussin humidifiers * Metal reinforcement * Adds rigidity to shape of the wick filter when moistened * Also adds stability with today"s softer, more absorbent paper that prevents "slumping" or "sagging" over time or when wet * Helps maintain the humidifier"s designed output What"s In The Box: * Bestair HW500 Extended Life Humidifier Filter