ADVANTAGES OF REUSABLE FILTER SLOTS - Reusable and easy to replace. They make filters for your machine more cost-effective and can reduce plastic waste, helping to protect the environment. FOAM POLLEN & ULTRA FINE - The foam filter helps capture larger particles. The ultra-fine filter helps trap smaller particles. Using them together helps deliver cleaner air. FOR A HEALTHIER HOME - This kit is designed to help provide cleaner air for you and your family, supporting respiratory health. Replace reusable filter slots every 3-6 months. Replace disposable ultra-fine filters 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 differences in display screens may cause slight variations in color. Measurement may vary by +/- 1-3 cm.