[COMPATIBLE WITH CPAP MACHINES] - Fits all M Series, PR System One Series, and SleepEasy machines. Each filter is designed to fit your machine precisely. [PREMIUM CLEANFLOW TECHNOLOGY] - The reusable black foam filter helps block large particulate matter, while the disposable white ultra-fine filter captures fine particles. Using them together helps deliver cleaner air. [HELP MAINTAIN MACHINE PERFORMANCE] - These filters help protect your machine by reducing the buildup of dust, dirt, and debris in the motor, supporting longer-lasting and more efficient operation. [30-PIECE ECONOMY 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 Note: This package includes only the items listed above. Other products are not included. Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement may vary by +/- 1-3 cm.