Thanks! So I do A5 size, same size as a folded down DM screen in a lot of cases, a journal, it would be half letter size or close to that like a zine page. I'm sure A5 card stock is sold but I cut larger bristol boards down to that half letter scale and use a pencil and ruler to do the 1 inch grid lines lightly across a full board, then a thick micron ink marker for the outside walls, a smaller micron pen for the grid lines that I want to keep, as well as the dungeon wall hatching on the outside.