Harkwell Labels have been printing sticker sheets to be inserted in to the entire range of the very popular Captain underpants books.

The sticker sheets are printed cmyk on to adhesive paper, gloss varnish is applied and they have then been cut to shape and sheeted. There is a perforation cut along the two sheets to make it fit perfectly inside each book.

Captain Underpants is a children’s novel series by American author and illustrator Dav Pilkey. The series revolves around two fourth graders, George Beard and Harold Hutchins, living in Piqua Ohio, and Captain Underpants, an aptly named superhero from one of the boys’ homemade comic books, that accidentally becomes real when George and Harold hypnotize their megalomaniacal principal, Mr. Krupp.

The series includes 11 books and 3 spin-offs, and won a Disney Adventures Kids’ Choice Award in 2007. As of 2013, the series had been translated in over 20 languages, with more than 70 million books sold worldwide, of that, over 50 million in the United States. DreamWorks Animation acquired rights to the series to make an animated feature film adaptation.