The Beholder, one of the most feared Dungeons and Dragons monsters. Also really, one of the weirder ones, I mean they are born from other Beholder's dreams and that is why they can be super weird and there are so many different types?
It measures 2" by 2.5". 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. 
Last pic shows all my currently available stickers.

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