Usage Tips:Designed for Perfect Compatibility: These ultra-fine filters are precisely engineered to for ResMed Airsense 11 Series CPAP machines, including the AirSense 11 autoset. The exact fit ensures a hassle-free replacement, maintaining the efficiency of your CPAP therapy. Constructed with Premium Safety Materials: Crafted from superior woven synthetic material, these filters are chemical-free and safe. They provide exceptional performance and optimal air filtration, ensuring that your CPAP machine operates at its best. Advanced Filtration for Cleaner Air: Effectively capture fine particles, dust, pet dander, and other airborne irritants. These filters enhance your breathing environment, allowing you to breathe more comfortably and confidently with cleaner, fresher air. Ease of Use and Regular Replacement: These filters are designed for quick and easy usage and replacement, supporting consistent CPAP therapy with clean air. For optimal performance, replace the filters every two weeks to maintain cleanliness and extend the lifespan of your machine. Color: White Material: cotton Package Contents: 40 * filter 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.