BENEFITS OF REUSABLE FILTER REPLACEMENTS - Reusable and easy to replace. They make filters for your machine more cost-effective and can reduce plastic pollution to be environmentally friendly. FOAM POLLEN & ULTRA FINE - The foam version is for blocking particles. The ultra-fine version is for blocking fine particles. Use them together to provide the cleanest air. FOR A HEALTHIER LIFE - Our kit is designed to provide you and your loved ones with the cleanest air to maintain lung health and protect you from potential diseases. Reusable filter replacement Replace every 3-6 months, disposable ultra-fine filter Replace every two 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 replacement 6 x Disposable ultra-fine filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real color. The allowed measurement error is +/- 1-3 cm.