This practical boat seat set is a great addition to your boat. Easy to clean: This boat seat is made of PVC and PU, making it waterproof and easy to clean and quick to dry. Durable material: The base of the boat seat is made of steel, making it sturdy and designed for a long lifespan. The black powder coating provides additional protection against the harsh marine environment. Comfortable: This boat seat features a high backrest that is padded with compression foam, allowing for a pleasant and back-friendly seating position throughout the day. Foldable design: The boat seat is collapsible; the backrest can be folded down when not in use. Universally compatible: This seat base is suitable for all boat seats with a flat bottom or where the hole size is compatible with ball bearings to meet various requirements. Good to know: Mounting screws are not included.