Based on their structure, construction techniques and unearthed artefacts, the two tombs are identified as brick-built burial chambers. Such tombs, commonly known as brick tombs or Han tombs, were relatively widespread in areas along major rivers and waterways, including the Lục Đầu Giang, Bạch Đằng, Y Bích and Lam river systems, which served as important links between settlements and the sea.