Combo pack will be enough to last all year, so you won't have to worry about running out of filters for your Airsense Machine COMPATIBLE WITH: CPAP filters are compatible with Airsense 10, Aircurve 10, Airstart and S9 Series CPAP filter kit is a disposable filter kit suitable for CPAP machines, suitable for various machines Each filter measures 2 3/32 inch x 1 3/8 inch (53 mm x 35 mm) to precisely fit your machine. Suggest replacing your filter every two weeks. Constantly changing the air filter can extend the quality of your machine. Color: white Material: cotton Package Contents: 120 x CPAP filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.