Transparent pockets. They are thick and sturdy, making it easy to stick stickers! (Although it's not a hard type, it's not the thin, flimsy type, but rather a sturdy, thick one) Since it's a 1-pocket type, you can store stickers while they are still on their backing sheets! The size is A7. 6-hole type. Can be inserted into a binder. I also have A7 size binders for sale, so you can buy them together! Sticker book refill Sticker backing paper Sticker notebook Bonbon Drop Stickers Puffy stickers / 3D stickers