1. 100pcs bag, 100% high-quality non-woven fabric. 2. -each screen measures 53 * 35mm, precisely matching your machine. 3. Compatible with various CPAP machines, suitable for AirSense 10 and AirCurve 10 to S9 series CPAP 4. Ultra- PM2.5 ultra-clean dust filter cotton, which can effectively filter extremely dust particles (PM2.5 level) in the , ensuring that you get clean and improve quality during the use of the ventilator. Disposable ultra- filter blocks particles. Effectively filter PM2.5 particle dust in the . White filter cotton is recommended to replace 1-2 pieces in 1 month. Not only help you keep your lungs clean, but also prevent dust, dirt and other substances. Specification: Color: White. Material: Non-woven Size: About 53 * 35mm Package Contents: 100 * Filter membrane Only the above package content, other products are not included. Note: Light 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.