Stackable magnetic organizer trays. Insert 5x3mm round magnets into the print sides to connect to each other. Bottoms and tops are angled so that they can be stacked on top of one another. Insides are sloped so that removing items is easier. Great for organizing board games, storing screws while working on a project, organizing parts when miniature painting, or anything else that requires keeping small parts separate, organized, and safe.