Anti-bacterial treated, traps minerals. Fits Bemis humidifiers. Metal reinforcement. Adds rigidity to shape of the wick filter when moistened. Also adds stability with today softer, more absorbent paper. Prevents slumping or insagging in over time or when wet. Helps maintain the humidifier designed output. Wick filter fits all table tops 300, 500, 700, 3000, 5000, 7000, B23, DP3 and E35 series, 3D6-100, 5D6-700, 7D6-100, B23-710, B23-810, D46-720, MA-0300, MA0500, TD6-710 (1040) 2pk.