The prints are on 13x19 matte photo paper, so the mats are 17x23.
Here's a peek at how they turned out...
|Prints matted and Mounted for Arisia
The 5 prints I'm sending to Arisia, after my first adventures in mat-cutting and mounting
|Line poster, matted and mounted
the border *just barely* fit into the mat we cut
|travel posters and grand safari poster
I still need to spray-mount my mockup broadsheet of Poe's Balloon-Hoax to foamcore; it's going to be on a table (with some costume pieces, including Conrad's head) where people can pick it up to peruse it.