Any size from 3½" x 5" to 16" x 24", and in some cases even larger (depending on format of original negative/slide).
Various papers, including matte, watercolor matte, velvet, luster, semi-gloss, and glossy.
High resolution electronic versions are available for stock photography only.
Mounted/unmated/unframed (on your choice of foamcore or posterboard).
Different colors, including full color, black & white, and sepia.