Specifications: Each filter is a combination of material engineered to block fine particles and large particulate matter, so you can breathe easy. Filters are an essential component for your CPAP therapy due to their ability to remove irritating dust, pollen, and tobacco smoke particles from your CPAP airflow. Fits for ResMed S9/S10. Type: Filters for ResMed Quantity: 20Pcs/Bag Material: Cotton Features: Disposable, Universal, Lightweight Size: 5.3cm x 3.5cm/2.09" x 1.38" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 20 x Filters for ResMed