This is a box set with a special horizontal design suitable for sleeved cards that would help you store your cards (standard Mayday sleeves).
The set also feature a nice graphics design and a content list.
Make sure you do not print from the browser preview and you disable fit to page.
Cut the full line, fold the dash lines, glue the grey areas.
Get more of my horizontal designs here: Regex' horizontal tuckbox series for sleeved cards.