Features: * Fits most Holmes humidifiers * Anti-bacterial treated * Traps minerals * 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 H-75C Humidi-Wick Replacement Humidifier Filter