[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 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 provide cleaner air. [KEEP YOUR MACHINE RUNNING LONGER AND MORE EFFICIENTLY] - These filters help keep your lungs cleaner and prevent dust, dirt, and debris from entering the motor, helping maintain device performance. [30 PCS 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 Note: Only the items listed above are included. Light reflection and display settings may cause slight color variations between the image and actual product. Measurement error allowed is +/- 1-3 cm.