Holmes WF2630 Evaporative Wick Humidifier wick filters For Models: BCM4505, BCM4509, BCM4510, BCM4530 Dense evaporative wick filter traps water-borne impurities Features antimicrobial protection to inhibit mold, mildew, and bacteria Measures 9 by 6-1/2 by 2-1/2 inches