It is made up of Heavy Duty Nylon cast frames and the Gasket is made up of Stainless Steel for superior corrosion resistance and durability. It is a very durable, long-lasting, water-resistant, and high-quality unit with solid cast frames for long-lasting durability. Easy to Install and ready to use, easily mounts to any flat surface, the closed-bottom with drain tail design allows for guided drainage to help protect the inside of your boat. Dimensions: White Color, 1-3/4 inch I.D., Length: 9-1/2 inch. Package Includes Pack of 10 Marine City White Nylon Flush Mount Rod Holder UV Stabilized 30 Degree with Cap Cover and 316 Grade Stainless Steel Gasket.