[COMPATIBLE & PERFECT FIT WITH VARIOUS SLEEP EQUIPMENT MACHINES] - Fits all M Series, for PR System One Series, for SleepEasy Machine! Each filter fits your machine precisely. [PREMIUM CLEANFLOW TECHNOLGIE] - The reusable black foam filter is to block large particles, the disposable white ultra-fine filter is to block fine particles. Use them together to provide the cleanest air. [KEEP YOUR MACHINE RUNNING LONGER AND MORE EFFICIENTLY] - Not only do our filters help keep your lungs clean, but also prevent dust, dirt, and other buildup from entering your engine. [30 PCS VALUE SET] - Includes 60 reusable black foam filters and 60 disposable white ultra fine filters, it is recommended to replace your filter every two weeks. Color: Black + White Material: Sponge + Cotton Package Contents: 60 * Reusable Black Foam Filters 60 * Disposable White Ultra Fine Filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color