40PCS CPAP ULTRA FINE FILTERS: Engineered to block the tiniest particles of dust to keep YOU & your CPAP machine healthier with of the freshest air!THE AND FILTRATION: Each filter measures 2 1/8 inchx 1 7/16 inch to fit your machine precisely. Each filter is designed to block dust.SAFE & EASY BREEZY TO USE: Each filter for CPAP goes beyond filtering harmful -contaminants. MADE of materials, Ultra Fine Filters are extremely safe and Bisphenol-A . You'll easier than ever without running the risk of exposing your lungs to any type of allergies. No smells either. Just beautifully designed filters that are extremely easy to change, replace or dispose of. FOR HEALTHIER LIFE- filters are designed so as to you and your loved ones with the cleanest air!Wide scope of application: The size of CPAP filters fully fits most CPAP machines, including all S9 series, AirSense AirCurve & AirStart series CPAP & BiPAPs.Specification:Color: WhiteMaterial: CottonDimensions: 2 1/8 inchx 1 7/16 inch (3.5x5.3 cm)Application: For all S9 series, AirSense AirCurve & AirStart series CPAP & BiPAPsPackage includes:40x CPAP Filters