[High-quality materials] The CPAP filter is made of high-quality materials, which can effectively filter fine particles, dust and pollen without affecting air circulation. perfect replacement for CPAP machines[Wide compatibility] This CPAP filter is very suitable for most CPAP machines, suitable for Respironics M series, PR System One series[Provide good protection for your machine] These CPAP filters help prevent dust, dirt and other fine particles from entering the CPAP machine, which can extend the life of the machine.[Perfect filter combination]-40 reusable black foam filters and 40 disposable white ultrafine filters. Including a total of 80 Pcs air filters, it is recommended to replace the filter every two weeks, one set can meet your needs throughout the year[Provide the cleanest air ]for you and your loved ones to keep your lungs healthy and away from potential diseasesWhite cotton sheet: 4.5 x 2.3cmBlack cotton sheet: 4.5 x 2.5cmColor: black + whiteMaterial: spongePackage Contents:40 pc x White cotton sheet40 pc x Black cotton sheetOnly the above package content, other products are not included.Note: Light shooting 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.