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 CPAP machines, including AirSense 10, AirCurve 10, and S9 series. Features ultra-fine filtration material that helps capture fine dust particles, including those equivalent to PM2.5, helping to maintain air quality during use. Disposable filter design helps block fine particles. Effective filtration of fine airborne dust. White filter material; it is recommended to replace regularly. Helps protect against 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: Light and display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3cm.