500 Pieces Jigsaw Puzzle  21'' x 15'' It effectively trains the player's concentration, logical thinking ability, and hand-eye coordination.  It is also a relaxing game and helping you to get better sleep before going to bed. Made of cardboard, durable and beautiful with self-standing. Give a custom puzzle as a gift by turning your favorite photos, designs, text into game today !  ・DIMENSIONS: 53 cm x 38 cm  ・MATERIAL: Cardboard + Chipboard ・HIGH-QUALITY MATERIAL: The puzzle pieces are made of high-quality cardboard which use eco-friendly printing ink on it. It’s safe and non-toxic, friendly for kids. And the pieces are bend-resistant with appropriate thickness for lasting playing and preserving. ・BOX PACKING: The puzzles are packaged in sturdy, attractive metal boxes for easy storage. And you can view the personalized pattern on the top of the box. ・GREAT GIFT: In case you are looking to fresh your brain with some good mental games or you want to quiet the mind. This puzzle gift can tap into your creativity and rewire your brains to make "connections". Add your own designs on it and make the gift exclusive and creative. ・Full color print on one side（The same pattern will be printed on the boxes）