1Strong and Durable: Cup holder is made of stainless steel, the main body of the bracket is made of high density memory sponge, anti ultraviolet waterproof Pvc. Strong structure ensures its long service life. 2Stable: The weighted Pvc clamshell secures the drink holder to the seat by tucking the clamshell inside the gap between the seat and the cushion, it will stay in place and ensure the drink is safe. 3Portable Design: The cup holder can be moved to where needed, convenient for pontoon, easy to remove or put away when the pontoon cup holder is not in use. 4The Right Size: The double cup holders are 3.1 inches to 3.5 inches in diameter and can hold most beverage containers, such as water bottles, beer, coffee cups, 10 oz to 40 oz glasses. 5Widely Used: Ideal cup holder for pontoons, fishing boats, yachts and motorhomes. They can be used as additional cup holders on a pontoon boat sofaand in the back of cars and motorhomes.