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 machines. This disposable filter kit fits 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. Regularly changing 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 and display differences, the color in the image may vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm.