WHAT YOU GET: Our filter kit includes 4 reusable Pollen Filter and 20 disposable Ultra-fine Filter. The filters are made in a way that blocks out small and large particles, while the wipes are designed to remove dirt and residue from your machine. COMPATIBILITY: Our Dreamstation filter kit is designed to work exclusively with the Dreamstation 2 CPAP & BiPAP machines. DreamStation 2 machines should never be run without a foam pollen filter in place. Our premium CPAP filters are made right here in the USA. HOW TO INSTALL: To install an ultra-fine filter in your DreamStation 2, slide the foam pollen filter out of the machine, securely snap the light blue ultra-fine filter onto the base of the foam pollen filter, and insert them both back into the device. DEEPER SLEEP AT NIGHT: Continue to enjoy a clean, fresh flow of air while you sleep with our DreamStation 2 Filters Kit, it is specifically crafted to provide you a high-quality performance every time you use them. These kits ensure your device delivers good-quality air so you can breathe better while you’re sleeping. The filters keep dust and dirt away from your machine, which can protect your health and make your device work wonders to add years to your life. MATERIAL: Our reusable foam pollen filters made of blended synthetic fibers in a gray carrier. Disposable ultra-fine filters made of polyester fibers in a light blue carrier. The pollen filter is designed to filter out dust and pollen. The ultra-fine filter, on the other hand, is meant to filter out smaller particles and unwanted odors.