[COMPATIBLE WITH VARIOUS SLEEP EQUIPMENT MACHINES] - Fits all M Series, PR System One Series, and SleepEasy machines. Each filter is designed to fit your machine precisely. [PREMIUM QUALITY CLEAN FLOW 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 provide cleaner air. [KEEP YOUR MACHINE RUNNING LONGER AND MORE EFFICIENTLY] - These filters help keep your device clean by preventing dust, dirt, and debris from entering the motor, which may help extend the life and performance of your machine. [60 PCS ECONOMICAL SET] - Includes 30 reusable black foam filters and 30 disposable white ultra-fine filters. Replacement every two weeks is recommended for optimal performance. Color: Black + White Material: Sponge + Cotton Package Contents: 30 x Reusable Black Foam Filters 30 x Disposable White Ultra-Fine Filters Note: Only the items listed are included. Other products are not part of this package. Light reflection and differences in display screens may cause slight variations in color between the image and the actual product. Measurement may vary by +/- 1-3 cm due to manual measurement.