Made from strong premium grade cardboard, with linen finish print to minimise glare on puzzle image. Ravensburger have over 50 years' worth of experience in the manufacture of puzzles. Individual pieces are stamped with such precision that a quiet ""click"" can be heard when one piece is inserted in the other - this phenomenon is so unique that we have given it its own name 'Softclick Technology.' Our puzzles are made using unique punching tools, which are hand-crafted to watchmaker precision to ensure the greatest possible accuracy and variety of the puzzle pieces. "