Dy n 80/20 Bronze thng c gi l dy “brass” (ng thau), c cht m sng nh hp kim 80% copper (ng ) v 20% tin (thic). 80/20 l t l hp kim lm dy acoustic nguyn bn do John D’Addario Sr. v John D’Angelico chn v thit k vo thp nin 1930. Dy n ny rt ph bin, thng c dng thu m nh cht m trm, sc nt kt qu ca hp kim t ng v nhiu thic hn so vi dy ng thic phosphor. y l b dy thu ht ngi chi theo ch ngha truyn thng v ngi am m s c in v yu t lch s ca dy n. Nh mi b dy D’Addario, 80/20 Bronze c qun quanh li thp carbon cao hnh lc gic, mang li m thanh sng, ngn di vi m iu tuyt vi.