This combo pack is designed to last for an entire year, providing a sufficient supply of replacement filters for your CPAP machine. These CPAP filters are compatible with Airsense 10, Aircurve 10, Airstart, and S9 Series machines. This disposable filter kit is precisely engineered to fit select CPAP devices. Each filter measures 2 3/32 inches x 1 3/8 inches (53mm x 35mm) for a secure and accurate fit. It is recommended to replace the filter every two weeks. Regular filter changes help maintain optimal machine performance and air quality. Color: white. Material: cotton. Package includes: 80 x CPAP Filters. The package includes only the items listed; other accessories are not included. Note: Lighting and display differences may cause slight variations between the image and the actual product color. Measurement error allowance is +/- 1-3 cm.