All-in-one kit makes it easy for kids to exchange valentines with the whole class (including the teacher!) | Marvel Valentine's Day card pack contains 32 perforated, tear-apart cards and one teacher card with fun designs featuring Spider-Man, Spider-Gwen and other favorite characters | Matching decorated box is the perfect way to collect Valentine's cards. Box folds flat into lid and unfolds quickly and easily to form a sturdy classroom exchange mailbox. Box features a 3D pop-up of characters on lid. | Assembled box measures 7.25" deep x 7.25" wide x 7.2" high. | Printed on high quality paper stock, Hallmark's stationery is made with paper from well-managed forests.