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: Unlike standard filters that are approximately 1mm thick, these filters are approximately 3mm thick, enhancing the filtration of fine particles, bacteria, viruses, and other airborne contaminants, improving the overall filtration performance of the respirator. Better Compatibility: Each filter measures 2 x 0.9 inches. Designed for a secure fit with Airsense 11 machines, minimizing gaps and improving filtration efficiency. Improved Air Freshness: Each filter is engineered to capture fine particles and larger particulate matter, delivering cleaner and fresher air from the ventilator, helping to improve air quality and support patient health and sleep quality. Extend Machine Life: These filters help prevent dust and impurities from entering the ventilator, reducing internal wear, lowering maintenance and cleaning costs, and 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 in the color of the item as shown. Measurement may vary by +/- 1-3 cm.