1. 6 Inch Length: You will receive 2 filter sleeves, each 6 inches long, suitable for 6-inch carbon filters. 2. Elastic Bands: Both ends of the polyester pre-filter sleeve are designed with elastic bands, which are flexible and easy to attach. 3. Practical: The filter cover is more suitable for 6-inch carbon filters to keep the filter operating normally, prevent it from being blocked by hair, dust, and other debris, and extend its service life. 4. Ideal Replacement: This air filter cover is practical and sufficient for daily use and replacement, making it an ideal replacement for the original filter. 5. Polyester Fiber: This filter sleeve is made of electrostatic polyester fiber and non-woven fabric, which is more breathable and filterable than ordinary cotton material, and can effectively absorb dust, lint, and other residues. Item Type: Pre Filter Sleeve Material: Polyester Fiber Gross Weight: 109g/3.8oz Color: White 2 x Pre Filter Sleeve