The brothers therefore do other types of metal work, as well. Among other items, they make saxophone mouthpieces, incense burners, and ashtrays using lost-wax casting. Bronze is an alloy of 80 % copper and at least 2 % of either tin or lead (or both). Most bronzes are made by casting.
青銅乃紅銅與錫或鉛的合金，銅的成分占 8 成，其他金屬含量至少各占 2 %；青銅器的製作方式以「鑄」為主，將銅塊熔成銅液、灌注鑄模而成。