Ilford R.20 Photographic plate, 10x12" (estimated). Your bid is for the ONE opened box. I have weighed the box at 850g. I have NOT checked the contents of the box, though from the weight it seems likely that it contains just one plate? These are date expired vintage items offered as a collectors item, or for display/curiosity only. I have no idea how they have been stored, or the viability for actual use. They may be usable, but maybe not. There is just no way of knowing. I do not have a dark room and have not tried. Caveat emptor.