100 pieces per bag, made of 100% high-quality non-woven fabric. Perfect fit – each filter measures 53 x 35mm, designed to precisely match compatible devices. Compatible with various CPAP machines, including ResMed AirSense 10, AirCurve 10, and S9 series CPAP devices. Features ultra-fine filtration material that helps capture fine dust particles, including those equivalent to PM2.5 size, helping to provide cleaner air during use. High-quality construction ensures reliable performance. The white filter material is recommended to be replaced every 1 to 2 weeks depending on usage. Helps maintain cleaner air by reducing dust, dirt, and other airborne particles. Specifications: Color: White Material: Non-woven fabric Size: Approximately 53 x 35mm Package Contents: 100 x Filter membranes Note: Lighting and display settings may cause slight variations in color between the image and the actual item. Measurement tolerance is +/- 1-3cm.