High Quality Material: These filters are made of ultra-fine fiber cotton which can effectively filter fine particles, dust, and pollen. BPA-free, safe and reliable. Thickened Design: While other filters are approximately 1mm thick, these filters are about 3mm thick, enhancing the ability to capture fine particles, viruses, and other harmful airborne substances, improving the overall filtration performance of the respirator. Better Compatibility: Each filter measures 2 x 0.9 inches. Designed to fit Airsense 11 machines with minimal gaps, ensuring improved filtration efficiency. Improved Air Freshness: The filters are engineered to capture both fine and larger particulate matter, resulting in cleaner and fresher air output from the ventilator, supporting better air quality and patient well-being, and potentially contributing to improved sleep quality. Extended Machine Life: By capturing dust and impurities, these filters help prevent contaminants from entering the ventilator, reducing internal wear, lowering maintenance needs, and extending the lifespan of the device. Color: White Material: Cotton Package Contents: 30 x Filters Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement tolerances may vary by +/- 1-3 cm.