Cast in the shape of a peck, or dou in Chinese, each ingot weighs just over 1 pound (0.45 kg). Ten blocks made up one unit called a small bundle, and 40 blocks made up one large bundle.
Details of tin production in early Malacca were recorded in the 1436 book Description of the Starry RaftbyFei Xin, a translator of Admiral Zheng He.
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