All Pipe & Line Floats are molded as one piece from tough, impact resistant high density polyethylene which will withstand sub zero temperatures. The floats will not rust or corrode and is resistant to most chemicals. A UV stabilizer is added to the polyethylene for excellent resistant to sunlight (UV). The low profile float design provides stability and reduced resistance to waves, currents, and winds. Additionally, all Nautilus Floats flotation products are foam filled to US Coast Guard specifications.