This combo pack provides a full year's supply of filters, ensuring you won't run out. These CPAP filters are compatible with ResMed AirSense 10, AirCurve 10, AirStart, and ResMed S9 series machines. This disposable 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 replacement helps maintain the performance and longevity of your device. Color: white. Material: cotton. Package includes: 80 x CPAP filters. Only the items listed are included; other products are not part of this package. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.