The mighty Derptopus. See the skull o fher hapless victim? Yeah she did that.
It measures 2" by 2.75". Made from thick, durable vinyl that is waterproof, UV protected, can last outdoors up to 5 years with a permanent adhesive. I have had a one of these on my car for about 4 years and can attest to its durability. 

If you are buying more than 3 stickers, please see this page for a price break:​​​​​​​https://www.skeletaldropkick.com/product-page/3-pack-of-stickers