The print, of course, in the size you choose. I personally print, inspect, and sign each of my Signature Fine Art Prints. The print is hinge-mounted to a single white mat, sized to complement the print. The mounted print is then placed in a clear, protective sleeve with a flat backing layer. The print is shipped flat.
Size B and C mats have v-grooves cut parallel to the window opening. The resulting shadow lines increase the visual interest of the finished piece..