The Builders Edge Ridge vent Plus 11" is the toughest, most durable ridge ventilation system available. Excels in keeping out weather and insects . Works efficiently regardless of wind direction or speed. Accommodates gable or hip, organic fiberglass, wood, slate or metal roof systems, residential or commercial, new construction or reroofing. Resists dents from tree branches or hammer blows to stay smooth and straight. Limited lifetime warranty. Proudly made in the USA!.