High Quality Material: 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: While other filters are approximately 1mm thick, these filters are about 3mm thick, helping to capture fine particles, bacteria, viruses, and other airborne contaminants, enhancing the 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: Each filter is engineered to block both fine and larger particulate matter, delivering cleaner and fresher air from the ventilator, which may help support better air quality and patient well-being, including improved 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 potentially extending the lifespan of the device. Color: White Material: Cotton Package Contents: 30 filters Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.