Features: * Reinforced design for longer life and better efficiency than standard wicking filters * Removes minerals from water * Anti-bacterial treated * Fits Bemis models 4000 and 6000 series * 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 CB41 Humidi-Wick Replacement Humidifier Filter