Usage Tips:30PCS 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 mini contaminants. MADE of high-quality materials, Ultra Fine Filters are extremely safe and Bisphenol-A free. 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 of application: The size of CPAP filters fully fits most CPAP machines, including all S9 series, AirSense AirCurve & AirStart series CPAP & BiPAPs.Specification:Colour:WhiteMaterial:CottonSize:3.5x5.3 cmPackage Contents:30 x CPAP Filters be kindly , the listed product is produced and distributed abroad and subject to the laws of country of origin.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.