Our puzzles are made from a sturdy pressed paperboard material that is 1.8 MM thick. This is about the average thickness of higher quality puzzles commonly found in stores. Your custom jigsaw puzzle is made to be handled, and the puzzles can be put together many times.  Our pieces come in a variety of traditional shapes created to fit only the piece meant to connect to it. Individual pieces fit only in their designated spot. Portrait Puzzles are comparable to the highest quality puzzles found in stores. We use a non-toxic, UV cured ink that creates a matte finish. The back of the puzzle is a light grey/brown.