This combo pack provides a full year supply of filters, ensuring you never run out for your Airsense machine. COMPATIBLE WITH: Resmed Airsense 10, Aircurve 10, Airstart, and Resmed S9 Series. This CPAP filter kit is designed to fit various Resmed CPAP machines. Each filter measures 2 3/32 inches x 1 3/8 inches (53mm x 35mm) for a precise fit. It is recommended to replace the filter every two weeks. Regular filter changes help maintain the performance and longevity of your machine. Color: White Material: Cotton Package Contents: 80 x CPAP Filters Note: The package includes only the items listed above; other products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3 cm.