Equipment required on board by the International Regulations for Preventing Collisions at Sea, 1972. The standard size is 610 mm (24") in diameter in a net folding type.

This series of marine signal ball products meet the requirements of the statutory Inspection Code for ships and Marine
installations, the International Code for preventing collisions at Sea in 1972, the 1996 Amendment to the 1974 SOLAS Convention and CB/T3142-94 CBhand T428-93. The shapes of marine signal balls are: sphere, diamond, cone, double cone and cylinder.