24 DAYS OF SURPRISES: Count down to the holidays or any other special occasion and receive 24 days of Attack on Titan-themed collectibles by opening a door each day. COLLECTIBLE PRIZES: This 24-day advent calendar features high-quality collectible items - buttons, sticky notes, coasters, mini booklets, pencils, and more - that are designed to last so that you can show off your love for Attack on Titan year-round.