Perko Stainless Steel Round Bi-Color Boat Navigation Light This Perko Stainless Steel Round Bi-Color Boat Navigation Light is composed of a stainless steel top and a black polymer base. Designed for maximum durability and long lasting use, it features starboard green and port red lenses. Certified for use on sail and power driven vessels under 12 meters 39.4 ft. in length, this boat navigation light will make a great addition to your boat. Features Certified For Use On Sail and Power Driven Vess