Features: * Reinforced design for longer life and better efficiency * Traps impurities in the water * MicroFree * Fits Holmes Humidifier models: HM-630, 729, 4600, 6000, 6000RC, 6005, 6600, 7203, 7203RC, 7204, 7305, 7305RC, 7306, 7306RC, 7405, 7405RC * Also fits Bionaire models: BCM645, 4600, 552ORC, 6000 6010RC, 6610RC, 7203RC, 7204, 7207, and 7305/RC What"s In The Box: * Bestair H100-6 Extended Life Humidifier Filter - 6-Pack