V-Strip Weatherstripping Seal—V-strip seals are made of stiff, folded material. One arm mounts to your door frame while the other presses firmly against the door to block airflow. They’re also known as tension seals. Bronze seals are durable and corrosion resistant, and often used on historical buildings to match the existing design. Stainless steel seals are stronger than rubber ones and more corrosion resistant than bronze ones. Often used in marine environments and food plants, they won’t degrade from contact with mild chemicals or detergents.