The Aroeve H13 True HEPA 4-Stage Air Filter is a high-quality cartridge filter designed for use with the Aroeve Model MK04 and MK04W air purifiers. Each filter has a lifespan of 6 months, providing efficient filtration for clean and fresh air in your home. This 2-pack ensures that you have a spare filter on hand, making it convenient to change out your old filter for a new one when needed. With its True HEPA filtration technology and carbon filter media, this product is perfect for improving indoor air quality and creating a healthier environment for you and your family.