The Holmes 2 Pack HWF64PDQ-U-2 Type B Humidifier Filter 1745 1746 is a set of white filters designed for humidifiers. Made by Holmes, these filters feature antimicrobial resistant technology to ensure clean and fresh air in your home. The filters have a mesh filter media for efficient filtration. With an aluminum filter frame material this product is a reliable choice for maintaining indoor air quality and improving overall home improvement.