[COMPATIBLE WITH CPAP MACHINES] - Fits for All PR System One Series and SleepEasy Machine. Each filter is designed to fit your machine precisely. [CLEANFLOW TECHNOLOGY] - The reusable black foam filter helps block particulate matter, while the disposable white ultra-fine filter helps capture fine particles. Using both filters together helps deliver cleaner air. [KEEP YOUR MACHINE RUNNING EFFICIENTLY] - Filters help keep your device clean by preventing dust, dirt, and debris from entering the motor, helping maintain performance. [30-PIECE ECONOMICAL SET] - Includes 15 reusable black foam filters and 15 disposable white ultra-fine filters. Replacement every two weeks is recommended for optimal performance. Color: Black + White Material: Sponge + Cotton Package Contents: 15 x Reusable Black Foam Filters 15 x Disposable White Ultra-Fine Filters Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement may vary by +/- 1-3 cm.