good quality Material: These filters are made of good-quality material which can effectively filter fine particles, dust,and pollen. Bisphenol-A free, safe and reliable. Excellent Filtration Effect: the HEPA filter can filter fine particles, , viruses and other harmful substances in the air, improving the filtration effect of the respirator. Perfect Compatibility: Each filter measures 2.1inch x 1.4inch. The size of filters fits most CPAP machines, including all for S9 series, for AirSense 10, for AirCurve 10 & for AirStart series. Improve The Air Freshness: Each filter is designed to block more fine particles and large particulate matter, the air output from the ventilator is cleaner and fresher, which helps to improve the air quality and protect the health of patients and Improves quality of patient's sleep. Extend The Life of The CPAP: CPAP filters can block the dust, impurities and other substances into the ventilator, effectively reduce the loss of the ventilator internal, reduce the cost of cleaning and maintenance of the ventilator internal, extend the life of the CPAP Machines. Maintain CPAP Machine Efficiency Regular replacement helps maintain your CPAP device's airflow and internal cleanliness, contributing to consistent performance over time. Color: White Material: Cotton Package Contents: 60 * CPAP Filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.