Perfect Compatibility: The true HEPA air purifier filter replacement is ONLY compatible with Blueair Blue Pure 411/411+ & Blueair 3210 Air Purifier (Please confirm your air purifier model before buying!) High Quality: The air purifier filter is made of eco-friendly and soft material that helps to improve the suction of the air purifier, such as pollen, pet dander, dust and smoke effectively, providing you fresh air Package Includes: 1 pack high quality air purifier replacement filter. Easy to install and replace, click into place without any tools Kindly Note: This is not a Blueair orig product and is not covered under any Blueair . The Blueair brand name and logo are the registered trademark of the respective owner.