10/20pcs Ultra-fine PM2.5 Dust Filter Cotton CPAP Filters Premium Disposable Universal Replacement F
Ultra-fine PM2.5 dust filters,filter fine dust particles.nIt is recommended to replace 1pcs within three month.nnSpecifications:nMaterial: CottonnSize: 5.3 X 3.5 cm/2.09 X 1.38inchnApplication: Professional for ResMed CPAP S9/S10nnNotes:n1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!n2. Please allow 1-3cm measuring deviation due to manual measurement.nnIncluded: 10PCS/20PCS as chose