This pack of three Holmes HWF100UC3 replacement wick filters is a must-have for any household with a humidifier. Designed with humidity resistance and a microfiber filter media, these filters provide excellent filtration technology to keep your indoor air quality at its best. With a filter life of 12 months, you won't have to worry about replacing them often. These filters are made of frameless material and are easy to install, making them perfect for anyone who needs to replace their old filters. With a MERV rating of 4, the white filters are ideal for improving the performance of your Holmes humidifier. These cartridges are manufactured in Mexico and come in a pack of four.