ADVANTAGES OF REUSABLE FILTER SLOTS - Reusable and easy to replace. They make filters for your machine more cost-effective and can reduce plastic waste to be more environmentally friendly. FOAM POLLEN & ULTRA FINE - The foam version is designed to capture large particulate matter. The ultra fine version is designed to capture fine particles. Use them together to help provide cleaner air. CLEAN AIR FOR A HEALTHIER LIFE - This kit is designed to help provide cleaner air for you and your family, supporting lung health. Color: Blue Material: Filter sponge Package Contents: 6 x Ultra Fine Filters 2 x Pollen Filters Only the above package content is included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3 cm.