High Quality Material: These filters are made of ultra-fine spinning fiber cotton which can effectively filter fine particles, dust, pollen Bisphenol-A free, safe reliable Thickened Design: Other filters are only about 1mm thick, but this filters are about 3mm thick, the filter can filter fine particles, bacteria, viruses other harmful substances in the air, improving the filtration effect of the respirator Better Compatibility: Each filter measures 2 x 0 9Inch The size of filters are better for Airsense 11 machines, no unnecessary gaps, better filtration effect Improve The Air Freshness: Each filter is designed to block more fine particles large particulate matter, the air output from the ventilator is cleaner fresher, which helps to improve the air quality protect the health of patients Improves quality of patient's sleep Extend The Life of The Machine: for Anzorhal Airsense 11 filters can block the dust, impurities other substances into the ventilator, effectively reduce the loss of the ventilator internal, reduce the cost of cleaning maintenance of the ventilator internal, extend the life of the Machines Colour:White Material:cotton Package Contents: 30 Filters Only the above package content, other products are not included Note: Light reflection different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is and\/- 1-3cm