... , different using .If FOR metling copper, gold ,silver, zinc, aluminium , lead , cast iron .etc Always using 2 .3 . 4 crucible.Between 2 ... for melting such metals as copper, gold ,silver, zinc, aluminium , lead , cast iron .etcAnd we have the special crucibles used in melting ... pure cast iron which need high temperature . Packing : In wooden case ...