Span marker or Aviation obstruction warning spheres are made up of either fiber reinforced plastic or aluminium as per the clients requirement. Aviation warning spheres are available in full white and full orange or full red & in combination of half white - half orange or half red. They are basically clamped with the top earth wire running on the trnasmission line tower in order to make the conductors visible to low fying aircrafts. Our aviation warning spheres are coated with the chemical which make them resistant to UV rays which helps them to retain their color for number of years. Other details for both type of spheres are mentioned below.