1. 55% open area allows for increased air flow. 2. Beautiful aluminum top and bottom, lightweight, durable. 3. Cylindrical internal foundation optimization without carbon leakage. 4. Remove dust from the air and give it fresh air, 99.9% deodorizing ability to keep you away from the smell. 5. Provides flexibility and a longer shelf life due to its unique fully reversible neck and the fact that it's filled with the highest quality carbon available. 6. This carbon filter can help you filter out cigarette smoke, plant based allergens and mechanical or any other foul smells at your house, workshop, commercial space, etc. Specification: Material: Stainless steel + cotton Diameter: 200mm Size: 4inch Package List: 1 x Carbon Filters