This combo pack is designed to last the entire year, so you won't have to worry about running out of filters for your CPAP machine. These CPAP filters are compatible with Airsense 10, Aircurve 10, Airstart, and S9 Series devices. This disposable filter kit is designed to fit CPAP machines precisely. Each filter measures 2 3/32 inches x 1 3/8 inches (53mm x 35mm) to ensure a proper fit. It is recommended to replace your filter every two weeks. Regular replacement of the air filter helps 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. Due to lighting reflections and differences in display screens, the color of the item in the image may vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm.