911 White 3M Prismatic Reflective Address w/ 3" Black Numbers Mailbox Marker Home Business Horizontal Mg2 Signs Reflective material to make it easier to find at night. Same material used on highway signs. Mountable with small nails, screws or even hooks which ever serves your purpose best We will make the numbers on your sign your mailing address unless contacted by customer with different instructions Holes in the corner making it very easy to mount on top, on the bottom or even on the side. Industrial grade aluminum for durability and long life. Never worry about rusting or breaking again.