Cost-effective component filter kit with 2 pieces of ultra-fine filters. Easy to replace. The ultra-fine powder-foam version prevents large particles. The ultra-fine version block fine particles. Use them together to provide the cleanest air. Healthier -our kits are designed to provide you and your loved with the cleanest air to stay healthy. This filters are only for CPAP Machine. Performance: Dust filter cotton Applicable object: air Uses: air filtration This filters are only for CPAP Machine Colour: blue + white Material: filter cotton Size: about 6.8 * 6.8cm Package Contents: 2 * filters 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.