Perfect Compatibility: Tailored for PR System One, M-Series, and SleepEasy machines, this filter kit ensures seamless integration and uninterrupted sleep therapy, enhancing your nightly rest and overall health. Advanced Filtration System: Featuring a dual-layer design, the reusable black foam filter captures larger particles, while the ultra-fine white filter traps smaller contaminants, ensuring the air you breathe during therapy is exceptionally clean. Comprehensive Set: Each package contains 60 filters, including 30 reusable black foam filters and 30 disposable white filters, providing a sufficient supply to meet your routine replacement needs for optimal machine performance and hygiene. Superior Quality Assurance: Crafted from high-grade materials, these filters effectively remove impurities from the air, safeguarding your respiratory health and enhancing the quality of your sleep by ensuring only the cleanest air is circulated. Enhance Machine Durability: Regularly replacing your machine's filters is crucial not only for maintaining air quality but also for extending the lifespan of your device, ensuring it operates efficiently for years to come. Color: Black & White Material: Sponge + Cotton Package Contents: 30 Pcs x Reusable Black Foam Filters 30 Pcs x 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 of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.