90PCS CPAP ULTRA FINE FILTERS: Designed to block even the smallest dust particles to keep you and your CPAP machine healthier with every breath of fresh air! THE PERFECT FIT AND FILTRATION: Each filter measures 2 1/8 inches x 1 7/16 inches to precisely fit your machine. Each filter is designed to block dust. SAFE AND EASY TO USE: Each CPAP filter goes beyond filtering out harmful mini contaminants. MADE OF HIGH-QUALITY MATERIALS, our ultra fine filters are extremely safe and BPA-free. You'll breathe easier than ever before without the risk of exposing your lungs to any type of allergy. No chemical allergies either. Just beautifully designed filters that are extremely easy to change, replace, or dispose of. CLEAN AIR FOR A HEALTHIER LIFE - Our filters are designed to provide you and your loved ones with the cleanest air! Wide Application: The size of CPAP filters fits perfectly with most CPAP machines, including all CPAP and BiPAP machines in the S9, AirSense AirCurve, and AirStart