This Multinautic floating drum is rotational molded with.15 in. thick walls. Top quality virgin polyethylene with ultraviolet inhibitors guaranty sturdiness and long-lasting use. This premium float can be used as replacement with existing docks or the key element to a brand-new dock. Whether you install it on a wood dock or an aluminum or steel structure, the heavy-duty fabrication of this float will resist the saltwater, sun, oil and gaz spills, hence our 15-year limited warranty, these floats are filled with closed-cell expanded polystyrene (EPS).