Arches smooth surface. approx 22 " x 30" It is a full sheet.
I am really enjoying this project. It's the largest I have ever attempted. Still a long way to go yet. Thar hardest part is managing it on my drawing board. It fits well sideways on but up the right way my board is no way big enough. I am working it mostly sideways. A challenge indeed. As long as I don't have to stand on my head. LOL.