These horns are the perfect fit for any sized car or truck. The longest horn is only 18 inches long with a 5 inch flare, but don't let the size fool you. This product is the loudest two horn air horn in its class. The Rocker horns are constructed of fiberglass reinforced ABS plastic, and are extremely durable. Plus, the horns are individually mounted, making installation on any vehicle a piece of cake.