[COMPATIBLE WITH VARIOUS CPAP MACHINES] – Fits all Respironics 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 white ultra-fine filter helps capture fine particles. Use them together for improved air filtration. [HELP MAINTAIN MACHINE PERFORMANCE] – These filters help protect your device by reducing the buildup of dust, dirt, and other debris in the motor. [30-PIECE ECONOMY SET] – Includes 15 reusable black foam filters and 15 white ultra-fine filters. Replacement every two weeks is recommended. Color: Black + White Material: Sponge + Cotton Package Contents: 15 × Reusable Black Foam Filters, 15 × White Ultra-Fine Filters Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.