These high quality filter wicks are made by a leading manufacturer to fit Portable Cool Mist Humidifiers from Holmes, Sunbeam, Bionaire and others. "Extended Life" design prevents by-pass air, extending the filters moisture output Traps water impurities Anti-bacterial treated Replace the filter (evaporating wick) at least once per humidification season or more depending on water conditions in your area Approx. Dimensions: 6 1/2" H x 5" ID x 7" OD x 1" Thick. Completely wet the filters (wicks) in a sink full of coolwater to help reduce mineral build-up. Replace all wet filters back into the humidifier base. DO NOT SQUEEZE OR WRING OUT THE FILTER (Wick). To help extend the life of your filters repeat this step each time you fill your humidifier.