Ravensburger has been manufacturing high-quality puzzles for over 130 years! Using extra thick. custom-developed European blue board. fine linen-structured paper to create a glare-free image. and handcrafted die cutting tools to prevent fraying or peeling and dust. each puzzle is made with great attention to detail. Best of all. every single piece is unique. no duplicates. for the perfect interlocking fit to guarantee a perfect interlocking fit. A great way to relax after a long day. or for family fun on a rainy day.