Lead and tin ingots exist at early period port sites such as at Khuan Luk Pat and other sites in the Southern and Central regions of Thailand. Here it was the practice to make the tin ingots into tries rounded forms as attested to by the finds at Dvaravati Culture sites of the 7th rich i to the 11th Centuries. In addition, the holds of wrecked ships of the Ayutthaya in the period have also yielded ingots of tin which would have served as trading commodities. These finds of tin in Thai land point to the fact that lead and tin were local resources for export. The Maritime Silk Routes were used for about a thousand years for commerce on i this route in the earlier stages of Thai from lead exports and there is some speculation that Sri Lanka may have been an importer since no lead mines existed on that island although lead was used in sites glazes in antiquity. This is evident from the excavations at Abhagiri Vihara and Anuradhapura (Aberatna 1990) and at same these sites there are numerous and varied traces of trading activities. Many goods (like beads) are similar to those found at Khuan Luk Pat. It was also found that many of the sites which have met been excavated in Sri Lanka are contemporary to Thai sites.