[COMPATIBLE WITH VARIOUS CPAP MACHINES] – Fits Philips Respironics M Series, PR System One Series, and SleepEasy machines. Each filter is designed to fit your device precisely. [PREMIUM CLEANFLOW TECHNOLOGY] – The reusable black foam filter helps block large particles, while the white ultra-fine filter captures finer particles. Using both filters together helps deliver cleaner air. [HELP MAINTAIN DEVICE PERFORMANCE] – These filters help protect your machine by reducing the intake of dust, dirt, and debris, supporting long-term efficiency. [30-PIECE ECONOMY SET] – Includes 15 reusable black foam filters and 15 white ultra-fine filters. Replacement every two weeks is recommended for optimal performance. 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 product and the image. Measurement may vary by +/- 1-3 cm.