The geographical location of Taiwan means that it has played a significant role in processes of cultural interaction and migrations between the mainland and islands of Southeast Asia (MSEA and ISEA). Copper/bronze metallurgy, for example likely dispersed across the South China Sea via these contacts/exchanges with the mainland, but we still have limited knowledge of how, when and why this occurred. First occasional occurrences of copper-based artefacts are attested in Late Neolithic contexts in Taiwan with an increasing presence moving into the Metal Age (late 1st millennium BC - early 1st millennium AD). Despite the developments of metallurgical research in the MSEA, the ISEA remained understudied. Current evidence seems to suggest that Taiwan did not produce copper locally during the Metal Age, rather raw materials were imported. However, the presence of molds on Taiwanese Metal Age sites indicate that secondary production activities were undertaken on the island, giving rise to a local copper-based craft exhibiting varying typologies. This paper focuses on two Shisanhang culture Metal Age sites; Shisanhang (200-1600 AD) in the northwest, which delivered one of the largest set of metal objects in Taiwan, and Blihun Hanben (500-1000 AD) in Yilan County that has produced molds demonstrating local secondary copper production, especially for bells and human shaped knife handles. Around 30 objects from these two sites were selected for archaeometric analyses (Optical Microscopy, SEM-EDS and ongoing Lead isotope analyses) in order to identify the different copper-base traditions of the Shisanhang culture. The research is aimed at identifying potential links with Metal Age Taiwanese cultures and other known copper-based metallurgical centres across Southeast Asia more broadly.