: These filters are made of ultra-fine spinning fiber cotton which can effectively filter fine particles, dust, and pollen. BPA-free, safe and reliable. Thickened Design: While other filters are only about 1mm thick, these filters are approximately 3mm thick, enabling effective filtration of fine particles, bacteria, viruses, and other harmful substances in the air, enhancing the overall filtration performance of the respirator. Better Compatibility: Each filter measures 2 x 0.9 inches. The size is specifically designed for Airsense 11 machines, ensuring a secure fit with no unnecessary gaps and improved filtration efficiency. Improve Air Freshness: Each filter is engineered to capture more fine particles and larger particulate matter, delivering cleaner and fresher air output from the ventilator. This helps improve air quality and supports better sleep quality and respiratory health. Extend Machine Life: These filters help block dust, impurities, and other contaminants from entering the ventilator, reducing internal wear and tear, minimizing maintenance and cleaning costs, and extending the lifespan of the device. Color: White Material: Cotton Package Contents: 30 x Filters Note: The package includes only the items listed above; other products are not included. Note: Lighting effects and monitor settings may cause slight variations in color between the image and the actual item. Measurement allowance is +/- 1-3 cm.