Virtually every other metal — with the exception of zinc and magnesium — is more noble than aluminum, and as such they all will cause aluminum to corrode at varying rates when the two are in contact. The farther the other metal is away from aluminum on the galvanic series, the more rapidly the aluminum will corrode. Therefore, while stainless steel will cause aluminum to corrode when the two are in contact under these conditions, the rate is not especially quick, and as such, the two are considered compatible. On the other hand, copper and copper alloys, including brass and bronze, are located farther away from aluminum in the series, and are therefore far more harmful; they are considered entirely incompatible with aluminum. Installing a bronze sail track, for instance, directly on an aluminum spar, would be considered a serious corrosion error.