Sur-Mark and Sur-Mark II regulatory buoys are molded from taught UV protected polyethylene, and are close cell foam filled to positively displace water. One-piece seamless construction, internal concrete ballast, recessed galvanized eye; both styles stand upright for storage. Color labels and Solar Lights (sold separately_ fit both styles. Chain and hardware not included. 18"" base diameter 40lb approximate buoyancy 39"" visible height above waterline | Taylor Made Sur-Mark Can Buoy, Green (49")