These stickers were a limited-time gift from 551 Horai, available for only two days! ꒰ღ˘◡˘ற꒱ There are two types: puffy stickers and stickers from an adult encyclopedia, both attached to a backing sheet designed to look like a pork bun box♪ These are no longer available! ♪(´ε｀ ) There's a slight crease on the backing sheet from when I received them, but it doesn't affect the stickers themselves, and it's barely noticeable. ꒰ღ˘◡˘ற꒱ I will sandwich them between thick cardboard and ship them in a plastic envelope♪