Injen1119BLKPre-FiltersInjen Technology's Hydroshield are designed to enhance the efficiency of any air filter, including Injen's SuperNano-Web and our 8-Layer oiled cotton gauze air filters. Injen's 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. , Injen's Hydroshields are engineered to divert damaging contaminants, which can clog your air filter and compromise peak air-flow and horsepower output. Injen's Hydroshield also extends the time between servicing intervals, reducing costs and improving the overall user experience.For that added protection during those unsure moments, Injen Technology's Hydro Shield prefilters feature race-proven material manufactured from highly durable polyester. Their uniform micron openings allow the filtering of debris .005 in. or larger. Injen Hydro Shield prefilters are factory-treated using an embedded hydrophobic process, which offers consistent airflow, repels water, and maintains horsepower gains. Snug and secure, the prefilters come in various sizes and colors. Keep dust, dirt, and debris out of your air intake system with these Injen Hydro Shield prefilters.