This bumper sticker is made of the best quality materials possible. It is made of metal. BEWARE of other sellers who are selling stickers that look like these, but theirs are in fact plastic, not metal like ours. These bumper stickers are made for many years of use. They have a self adhesive sticker on the back side that attaches to your bumper or wherever else you wish to stick these on. You will not be disappointed! Sticker is 2 & 3/4" across!