It may not last long
This product looks great if you can get it all onto the mailbox.  It is far nicer looking than the number stickers you can buy at the store.  However, the process to apply it to a clean, already standing mailbox was less than perfect.  I have installed many of these types of Cricut decals from vendors onto all types of surfaces, so I understand the process and have the experience to do it right.  The clear sticky was too sticky and the white decals were not sticky enough.  Once you remove the paper backing you stick the clear sheet with the white decals still on it to your mailbox.  It will take you at least 30 minutes per sheet to remove the clear sheet, leaving just the decals.  As I pulled incredibly slowly working the clear sheet back and forth off the mailbox and using a credit card to press the white onto the mailbox surface, the E's and W's still tore.  The rest was incredibly hard to get off the clear sheet and to stay on the mailbox.  Then, one E refused to stick to the mailbox at all.  I had to obtain glue and glue it on, which was an imperfect fix.  Based on the fact that the actual decal product lacks the stickiness many others normally maintain, I have serious concerns that this will last very long in windy, rainy, snowy weather.  In fact, even the sun may bake it right off.  It gets points for fashion, but loses stars for the difficulty in application and its durability.
Rating: 3 stars