From Navigational Marking
Our mooring buoys are rotationally moulded polyethylene (LLDPE) with a wall thickness of 8 mm. The buoys are filled with polyurethane foam, a closed cell foam competing out the cheaper polystyrene foam used in mooring or anchor buoys. The filling density of the PU foam is 35 kg/m3. All steel parts are hot dipped galvanized. Our small 90 liter buoy comes with 3 riddled hole options: Ø 40 mm, 50 mm or 90 mm.