Rubble cargo ships provide transport services for stones that are mixed according to the requirements of the order.
Ieshima companies which process and crush stones on Nishijima and Tangajima have their own rubble cargo ships.
As the rubble can be loaded directly onto the Gatt ships from the company wharves, quick deliveries and cost reduction are possible.
Coupled with a stone quality that is suitable for use in construction, the region boasts the highest supply of these stones to the Kansai region.