I am guessing that they are printed on some type of solvent printer because the clarity of the images are incredible. We are printing direct to a rigid material on an FB700 but the photo quality is not as good. So I was trying to see what I need to do to get to that quality - not sure if the current lightboxes can handle a thinner material -They probably could but I have never tried. I hear of all kinds of issues that printing to backlit material causes but have never printed. We just bought a new Epson so I am just figuring out what material I should use.