Using silicone treated polyester the K&N Drycharger fits over your air filter and protects it from water and debris. Fits over K&N oval-tapered air filters and acts as a pre-filter wrap.Fits over K&N oval-tapered air filtersSilicone treated polyesterActs as a waterproof pre-filterMade from a durable silicone treated polyester, the K&N Drycharger filter wrap has stitched elastic openings and a water-repellent treatment that lasts for between 1 and 2 years.The filter wrap contains micron size openings that allow high airflow and improves performance while protecting your filter from water and debris.Protecting and allowing increased airflow the K&N Drycharger filter wrap can extend the service interval of your K&N air filter and is an extra measure to keep your air filter clean and water-free.Dimensions: Base Inside Width: 3.75 in (95 mm) Base Inside Length: 3 in (76 mm) Top Inside Width: 2 in (51 mm) Top Inside Length: 3 in (76 mm) Height: 6 in (152 mm)