It is made up of Acrylonitrile Butadiene Styrene plastic, specifically designed for marine applications. It’s very durable and long-lasting, has a space-saving folding design, easy installation, and could be mounted on any flat vertical surface. It is very easy to install, and ideal for marines, ships, cars, watercraft, RVs, and many more. Dimensions: Closed Size: Length: 4-1/4 inches, Height: 1-1/8 inches, Width: 4 inches, the arms diameter adjusts from 2-5/8 inches to 3-1/2 inches. Package Includes Pack of 1 Marine City White ABC Plastic Adjustable Arms Folding Cup Drink Holder.