This pottery discovered at the Sangmo-ri site in Jeju, was represented a typical type of plain coarse pottery of the Bronze age in korea is characterized by a line of perforations along the lip with narrow bottom, wide mouth and a bowl-shaped body. This pottery also has the feature of X lines incised along the double-mouth rim as well as the perforation along the lip. Experts believe that the item is a great example to show that the Heunam-ri type pottery featured by the shape of a top from the Mid-western region in korean peninsula, was introduced to Jeju-do via the Nakdong river region and the Southern coastal region of Korea.