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 environmentally friendly. FOAM POLLEN & ULTRA FINE - The foam filter blocks particulate matter. The ultra fine filter captures fine particles. Use them together to help provide cleaner air. FOR A HEALTHIER ENVIRONMENT - This kit is designed to help provide cleaner air for you and your family, supporting respiratory health. Reusable Filter Slot: Replace every 3 to 6 months. Disposable Ultra-Fine Filters: Replace every 2 weeks. Specifications: Applicable models: For DS500 / 700, etc. Color: Blue + White. Material: ABS + Cotton. Size: 5.7 x 2.5 cm. Package Contents: 6 x Reusable Filter Slots, 6 x Disposable Ultra Fine Filters. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement may vary by +/- 1-3 cm.