The TDL 30 is an information buoy ideal for marking speed, rocks and swimming areas. The TDL 30 is white with the option to add a variety of signages and graphics as well as custom paintings. Prior to filling the TDL 30 spar buoy with EPS foam beads, 22.7 kg (50 lbs) of concrete is poured into the base interior, for ballast. This buoy utilizes the same materials and manufacturing technologies as offshore navigation buoys and has a white shell for high visibility. TDL 30 is available in can or conical shapes and has an option for an internal radar reflector.