1、Long Lasting: Constructed from stainless steel, cup holder has a bracket made from high density memory sponge along with an anti ultraviolet waterproof PVC main body. This strong structure guarantees extended durability. 2、Secure and Stable: 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. 3、Moveable Structure: This pontoon double drink holder can be relocated as needed. It's ideal for pontoons and can be easily removed or stored away when not in use. 4、Perfect Size: Double cup holders boast a diameter of 3.1 to 3.5 inches, accommodating most beverage containers, such as water bottles, beer cans, coffee mugs, and cups ranging from 10 to 40 oz. 5、Multifunctional: The cup holder is perfect for pontoons, fishing boats, yachts, and motorhomes. It can serve as additional cup holders on a pontoon boat sofa, and even in the back of cars and motorhomes.