It is a white cardboard with bevelled edges placed between the frame and the photograph. The mat has a double function:
Woody Allen in the movie "What's Up, Tiger Lily?"See all photos from Imago Images
Imago Images - United Archives
Your photograph is printed on a high quality satin photo paper in 250g thickness. Thanks to our high-performance printing systems and a sharpness of up to 1440 dpi, we guarantee you a product worthy of the greatest art galleries. If, despite our expertise and precautions, you notice something wrong with your product, we will send you a new photograph at our expense.
Kbdig, Hoch, What's Up Tiger Lily, Premiumd