Fitment Information Direct fit for many Injen air filters and/or universal applications 5" Base - Average Dimension of 5in Base x 5.0in Tall x 4in Top  6" Base -  Average Dimension of  6-7/8in Tall / 5-1/2in Top Specs & Features Select if your filter has a 5" or 6" Base Shielding the filter from contaminants resulting in more power Extends the service life of your air filter Hydrophobic treatment to help repel water (does not make your filter water proof) Made in Pomona California, USA Injen Technology Limited Lifetime Warranty Product Description Injen Technologys Hydroshield are designed to enhance the efficiency of any air filter, including Injens SuperNano-Web and our 8-Layer oiled cotton gauze air filters. Injens Hydroshield is constructed from a proprietary base media and then treated with a hydrophobic water-repellent. Our Hydroshield is UV resistant, can stop contaminants down to .005, is puncture resistant, and has elasticity characteristics which helps the Hydroshield to return to the original shape/position after servicing. Injens Hydroshields are engineered to divert damaging contaminants, which can clog your air filter and compromise peak air-flow and horsepower output. Injens Hydroshield also extends the time between servicing intervals, reducing costs and improving the overall user experience.