These puzzles are both fun and educational, providing hours of entertainment for the entire family. Linen paper is used and finished with an anti-glare coat for a perfect look. 100% recyclable product, environmentally friendly and non-toxic Smart-CutTM Technology - this cutting edge manufacturing process creates a multitude of unique and unusual shapes which fit together perfectly. Just like snowflakes, no two pieces are alike. This will make puzzling particularly challenging and stimulating.