These are Japanese language movie flyer (chirashi) for various movies.
These double-sided flyers are roughly B5 size (7"x10" or 18cmx26cm). Some flyers also also pamphlets or fold out posters as well.
Each will either be shipped flat in a rigid mailer or rolled in a tube, depending on other items ordered with it.
Note, the Spy X Family, Across the Spider-Verse, and Super Mario Movie flyers are sets where you receive two different ones. The Spy x Family also comes with an Anya "heh" sticker.