apartment mailbox 4 or 6 doors letter box aluminum or steel are ok the apartment mailbox is popular in Europe, special in Italy.have two size now, one is 4 doors mailbox, another is 6 doors mailboxcan fixed on the wallif aluminum mailbox, the finish is oxidative, can provide gold, silver, black, red, bronze and green color, but the Bronze and silver are more popular for aluaminum letter boxif ...