This was one of the only sizes amongst many stores that would fit my puzzle. My puzzle is 18x19 and the frame 18x22. The glass is plexiglass and the backing is cardboard. If youre planning to have a white background the plain cardboard may not be white white and may have a scuff or two like mine did. I painted over it with white acrylic paint and I think it looks pretty good! It also didnt come with any hanging hardware but that was easily remedied by a trip to the hardware store. All in all a fairly decent frame and I love the color with my puzzle