FILTERWEARS Pre-Filter K258Y For K&N Air Filters RC-4700 RC-4470 Reduce overall maintenance cost, Increases filter service intervals, Add convenience, Extend the life of any filter exposed or not Keep your high performance filter free of debris/dirt and water, Effective barrier for any particle bigger than .005inches No reduction of functionality in freezing temperatures, Hydrophobic fabric is standard (water repellent), Handle heat up to 450 degrees Fahrenheit Made from 100% monofilament polyester, with straps at the base of pre-filter for ease of installation Size: 4"TD, 6"BD, 6.75"H