ADVANTAGES OF REUSABLE FILTER SLOTS - Reusable and easy to replace. They make filters for your machine more cost-effective and can reduce plastic pollution to be friendly to environment. FOAM POLLEN & ULTRA FINE - The foam version is to block particulate matter. The ultra fine version is to block fine particles. Use them together to provide the cleanest air. FOR HEALTHIER LIFE - Our kit is designed so as to provide you and your loved ones with the cleanest air to maintain the health of your lungs and keep the potential diseases from you. Reusable Filter Slot Replace Once every 3-6 months,Disposable Ultra-Fine Filters Replace every 2 weeks. Specifications: Applicable models: For DS500 / 700, etc Colour: blue+white Material: ABS+cotton Size: 5.7 x 2.5cm Package Contents: 6 x Reusable Filter Slot Replace 6 x Disposable Ultra Fine Filters 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!