They were a brand of cartoon transfers available when I was a kid.
We used to stick them on all our school books.
They just popped into my head last night.
Did a Google on them today but couldn't find any decent information.
Just this image, this image and this image.
Someone probably decided that they cause cancer or something so they went off the market. They were just the coolest.
You had to be fairly steady not to crack the image.
Oh, the good old days, eh!