This kind of buoys produce under the rules of IALA with different colour and dimensions.
The construction material is POLYETHYLENE and the inside of the buoy is filled with EPS or POLYURETHANE according to the purpose of use.  
Manufactured in accordance with bad weather and sea conditions.
IALA buoys can be equipped LIGHT-METEOROLOGICAL SENSORS-SOLAR PANELS-AIS ATON-RACON etc.