: 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 only about 1mm thick, these filters are approximately 3mm thick, allowing for improved filtration of fine particles, 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 designed to fit Airsense 11 machines with minimal gaps, ensuring a secure fit and improved filtration efficiency. Improve Air Freshness: Each filter is engineered to capture fine particles and larger particulate matter, delivering cleaner and fresher air from the ventilator. This helps improve air quality and supports better sleep quality for users. Extend Machine Life: The filters help prevent dust, impurities, and other contaminants from entering the ventilator, reducing internal wear and tear. This minimizes maintenance needs and extends 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 between the color shown in the image and the actual product. Measurement tolerances may vary by +/- 1-3 cm.