iMustech Mailbox Numbers, 2 Pcs/Set Solid Self-stick Number 0 for Mailbox Door Apartment Hotel, 2-3/4 Inch, 3D Golden Metal Heavy Adhesive Quality: The door numbers decals are made of the alloywhich keeps it light but golden plating keeps it shining. They are in high quality with 3M adhesive on backside, no nails or screws is necessary.