Appeared from the New Stone Age, jar coffins were used to bury the deceased. Initially, coffins were made with jars that had served as everyday vessels. However, large jars were eventually made to bury the dead in the Yeongsangang River basin area from the forth to sixth centuries, developing into the unique tomb style of this region.

This twin jar, consisting of two pots mounted one on top of the other, is a distinctive style of earthenware that is only found in the areas of Mahan and Baekje. The large lower pot features a wide, flat bottom, a shoulder with two small protuberances, and a part that is connected with the upper pot and decorated with a series of diamond patterns, while the small upper pot features two small protuberances on a shoulder decorated with a diamond pattern.

These three-legged earthenware objects exhibit the unique style of Baekje earthenware. Each artifact displays characteristics unique to the area in which it was produced. Their different production periods can be identified by the presence or absence of a lid.