The flat rack shipping normally speaking, it belongs to the container shipping. The flat rack shipping is also called FR containner shipping, the reason that we use this kind of shipping solution is based on the shipping effiency and the cost consideration. The FR containers including the 20 ft FR container and the 40 ft FR contianer, of course the 40 FR container is the most widely used ones. 

    The oversized cargo is very common in the international transportation, but the bulk cargo shipping and RO-RO shipping is expensive, that's the reason why we use the FR container shipping. And also, there is another reason that is concerned is some of the ports is not bulk cargo or RO-RO ships. The FR container becomes our option.