Mixed Zinnias Mailbox Cover Artist: Mary Lake-Thompson Design is the same on each side to decorate both sides of the mailbox. Made to fit standard (T1) 6.5 inches wide x 19 inches wide mailbox Complete with set of 1 inch vinyl self-adhesive numbers. These may be placed on the cover or on the mailbox door. Polypropylene material will withstand the heat of Arizona and the cold of Minnesota.