Feature: 1. Easy Installation: Replacement filter is a part of breathing machine, which is easy to install, does not need any special tool. 2. Portable Size: Oxygen concentrator filter is small in size and light in weight, which is easy to carry in your bag for convenient use. 3. Smoothing Edges: Oxygen concentrator filter adopted fine workmanship, with excellent details and rounded edges, will not scratch your hands. 4. Excellent material: Oxygen concentrator filter box made of Excellent material, firm and sturdy, which are not easy to be damaged. 5. Regular Replacement: Breathing machine filter should be replaced regularly to keep the machine in a good working condition. Specification: Item Type: Oxygen Concentrator Filter Special secondary filter for Invicom oxygen generator Material: plastic colour: As Shown Package Contents: 1 x Repalcement filter Only the above package content, other products are not included. Note: Light reflection 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.