Feature: 1. Filter Dust: Filter cotton can effectively filter PM2.5 ultra fine particle dust in the air to ensure that users get clean air when using the breathing machine. 2. Fitment: Designed for S7, S8, VPAP IV ST series breathing machine, can be easily installed, no complicated tools and procedures are required. 3. Regular Replacement: It is recommended that users replace the filter once or twice a month to help prolong the service life of the breathing machine. 4. Cotton Material: Filter cotton is made of high quality cotton material, safe and eco friendly, and eco friendly, soft, good filtering effect. 5. Multiple Applicable Place: 2pcs of filter cotton are available, meet your use needs. Small and light weight, easy to carry, suitable for home, hospital and other places. Specification: Item Type: Breathing Machine Filter Cotton Material: Cotton Scope of Application: Fit for S7, S8, VPAP IV ST series breathing machine Package List: 2 x Filter CottonMultiple Applicable Place: 2pcs of filter cotton are available, meet your use needs. Small and light weight, easy to carry, suitable for home, hospital and other places. Cotton Material: Filter cotton is made of high quality cotton material, safe and eco friendly, and eco friendly, soft, good filtering effect. Regular Replacement: It is recommended that users replace the filter once or twice a month to help prolong the service life of the breathing machine. Fitment: Designed for S7, S8, VPAP IV ST series breathing machine, can be easily installed, no complicated tools and procedures are required. Filter Dust: Filter cotton can effectively filter PM2.5 ultra fine particle dust in the air to ensure that users get clean air when using the breathing machine.Number of Pieces: 2. Reusability: Reusable. Duration: 1 months. Material: Cotton. Brand: Demeras. Manufacturer: Demeras. Date First Available: March 18, 2022. : B09VXYB84M. Item Weight: 0.071 ounces. Package Dimensions: 4.33 x 1.57 x 0.39 inches.