40PCS CPAP ULTRA FINE FILTERS: Engineered to block the tiniest particles of dust to keep YOU & your CPAP machine healthier with every 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 Micro-contaminants. MADE of high-quality materials, our Ultra Fine Filters are extremely safe and Bisphenol-A free. You'll breathe easier than ever without running the risk of exposing your lungs to any type of allergies. No chemical smells either. Just beautifully designed filters that are extremely easy to change, replace or dispose of. FOR HEALTHIER LIFE-Our filters are designed so as to provide 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: White Material: Cotton Dimensions: 2 1/8 inchx 1 7/16 inch (3.5x5.3 cm) Application: For all S9 series, AirSense AirCurve & AirStart series CPAP & BiPAPs Package includes: 40x CPAP Filters Only the above package content, other products are not included. Note: Light 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.