This combo pack will be enough to last the whole year so you will not have to worry about running out of filters for your Airsense Machine COMPATIBLE WITH: This CPAP Filters are compatible with Resmed Airsense 10, Aircurve 10, Airstart and Resmed S9 Serie CPAP Filter Kit is filter kit fitting CPAP Machines,Fit with Various Resmed Machines Each filter measures 2 3/32inch x 1 3/8inch (53mmx 35mm)to fit your machine precisely. Suggest replace your filter every two weeks. The consistent change of the air filter can prolongs the quality of your machine. Colour: white Material: cotton Package Contents: 80 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 the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.