The Crucial Air Replacement Humidifier Filter is designed to fit Holmes models HM720 and is compatible with part number HWF 100. This package includes 3 filters, each measuring 8.0x6.2x3.1 inches and weighing 0.1 pounds. The filter is made by Crucial Air and is suitable for various Holmes models, ensuring clean and fresh air in your home. Easy to install and providing efficient filtration, this replacement filter is an essential component for maintaining indoor air quality.