Feature:1. APPLICABLE MODEL: Compatible with for Blueair Pro M, L and XL air purifiers(Pro M is 1 filter, Pro L is 2 filters, and Pro XL for 3 filters)2. REMOVE POLLUTANTS: True filtration effectively catch harmful ultrafine pollution particles as small as 0.1 microns and catch up to 99.97 percent of air pollutants from the air3. FOR ALLERGIC PEOPLE: This air purifier filter element is great for people allergic to dust, pollen, pet hair and dander4. HYGROSCOPIC COTTON: Adopt excellent cotton material, which is porous, hygroscopic, heat resistant, you can use with confidence5. STABLE AND DURABLE: Air purifier filter element come with stable structure, excellent performance and long service lifeSpecification:Item Type: High Efficiency Particulate Air Filter ElementMaterial: High efficiency particulate arrestment and cottonApplicable: For Blueair Pro M L XL.Package List:1 x Filter Element