: These filters are made of ultra-fine spun fiber cotton which can effectively filter fine particles, dust, and pollen. BPA-free, safe and reliable. Thickened Design: Unlike standard filters that are approximately 1mm thick, these filters are approximately 3mm thick, enhancing the ability to capture fine particles, bacteria, viruses, and other airborne contaminants, improving overall filtration performance. Better Compatibility: Each filter measures 2 x 0.9 inches. Designed for a secure fit with Airsense 11 machines, minimizing gaps and optimizing filtration efficiency. Improve Air Freshness: Each filter is engineered to capture both fine and larger particulate matter, delivering cleaner and fresher air from the ventilator, supporting improved air quality and better sleep quality. Extend Machine Life: These filters help prevent dust and impurities from entering the ventilator, reducing internal buildup, minimizing wear, lowering maintenance needs, 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 and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.