ADVANTAGES OF REUSABLE FILTER SLOTS - Reusable and easy to replace. They make filters for your machine more cost-effective and help reduce plastic waste. FOAM POLLEN & ULTRA FINE - The foam filter helps block particulate matter. The ultra fine filter helps capture fine particles. Use them together for cleaner air. FOR A HEALTHIER ENVIRONMENT - Designed to help provide cleaner air for you and your family. Reusable Filter Slot Replace every 3-6 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 2.5cm Package Contents: 6 x Reusable Filter Slot 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 item. Measurement may vary by 1-3cm.