100 pieces per bag, made of 100% high-quality non-woven fabric. Each filter measures approximately 53 x 35mm, designed to fit compatible CPAP machines, including AirSense 10, AirCurve 10, and S9 series models. Features ultra-fine filtration material that helps effectively capture fine dust particles, including those at the PM2.5 level, helping to maintain cleaner air during use. Disposable filter designed to help reduce airborne particles. White filter material recommended for regular replacement. Helps protect against dust, dirt, and other particulates. Color: White. Material: Non-woven fabric. Dimensions: Approximately 53 x 35mm. Package includes: 100 x Filter membranes. Light and display differences may cause slight color variation between image and actual item. Measurement allowance: +/- 1-3cm.