Features: brand new and high quality High-quality filters: 15 high-quality CPAP filters for better breathing. Exact match: Ensure that the CPAP filter is exactly matched with your CPAP machine. Filter dust: These filters maintain air filtration in the CPAP machine as needed to ensure the quality of sleep. Best results: Keep the air you inhale with the CPAP device clean to get the best results from your treatment. How to use: Change the CPAP filter regularly to maintain good breathing. It is recommended to replace the filter every 1-2 weeks or more frequently. Specifications: Material: Cotton Piece Weight: 20g Size: 4x5cm/1.57x1.97inch Color: White Package Includes: 15x Disposable CPAP Filters note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.