These can easily be cleaned, or you can keep them with there natural patina beauty. These small 4” G. Laffi Peru copper bowls are very, very hard to come by. These are original. They are not replica. G. Laffi was an Italian born artist that had a VERY UNIQUE style and these were very far from mass produced. These can be framed together ore seperatey. They are beautiful and would make quite a statement and display.