Sur-Mark Regulatory Buoys are molded from tough UV-protected polyethylene and filled with closed-cell foam to positively displace water. Feature one-piece seamless construction, internal concrete ballast, and recessed galvanized eye. Available with your choice of brightly colored, fade-resistant labels. 40-lb. buoyancy. 49"H x 10" dia. with 18" dia. base. Visible 39" above waterline. Three-year flotation warranty.