The WTF Stickers are permanent, customizable stickers that are suitable for outdoor use due to their excellent adhesion on various surfaces and their strong resistance to water. The "egg shell" composition makes removing them almost impossible. They break apart into a thousand pieces!
The WTF 'Priority Mail' Stickers are based on the USPS (United States Postal Service) priority mailing labels. These adhesive labels have become a very popular tool for sticker bombing in the United States.