This combo pack is sufficient to last the entire year, so you do not have to worry about running out of filters for your Airsense machine. These CPAP filters are compatible with Airsense 10, Aircurve 10, Airstart, and S9 series CPAP machines. 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. Only the items listed are included; other products are not included. Note: Light reflection and different display settings may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement error allowance is +/- 1-3 cm.