3" x 3" Penguin Post-it notes. The sticky notes are custom Post-it note branded, so they have great stick power (notes stuck to my door, mirror, and wall are still hanging on 2 weeks later) and leave no residue! 50 sheets.
There's also a limited amount of pastel blue penguin Post-its available!
Note: the original blue penguin post-it notes have very small pink dots in the printing at the top of the note. I don't find it super noticeable, but I included a zoomed in photo (#3) so you can see!