White Mountain Puzzles is known for our 1,000 piece jigsaw puzzles. By far our most popular piece count, our 1,000 piece puzzles are made of premium blue chipboard with large pieces that interlock well enough to pick up from corners and still stay together. The finished size is 24"x30" - the largest 1000 piece puzzle in the industry. "I love the White Mountaim puzzles, they are uniform in shape and so easy to pick up and place. A very good quality of puzzles. I would recommend them to all my puzzlers." Dixie Norris