FILTERWEARS Pre-Filter K301K For K&N Air Filter RF-1037 Reduces overall maintenance cost, Extends filter service intervals, Adds convenience, Extends the life of any filter exposed or not Keeps your high performance filter free of debris/dirt and water, Effective barrier for any particle bigger than .005 inches No reduction of functionality in freezing temperatures, Hydrophobic fabric is standard (water repellent), Handles heat up to 450 degrees Fahrenheit Made from 100% monofilament polyester, straps at the base of pre-filter for easy installation Size: 5.0"T, 6.5"B, 6.5"H