ADVANTAGES OF REUSABLE FILTER SLOTS - Reusable and easy to replace. They help make filters for your machine more cost-effective and reduce plastic waste, supporting environmental sustainability. FOAM POLLEN & ULTRA FINE - The foam filter blocks particulate matter. The ultra fine filter captures fine particles. Using them together helps 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 should be replaced every 3 to 6 months. Disposable Ultra-Fine Filters should be replaced 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 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 1-3 cm.