Larsen puzzles have a frame that allows the pieces to be easily placed again and again. Each piece has a unique shape that fits only in one place within the frame. Because the total thickness of the recycled cardboard in Larsen puzzles is 4.4 mm, they will last for years. With the Larsen "Land and World Maps" theme, you can learn about the entire world, including flags, through play. The perfect way to take your geography knowledge to the next level! Why Larsen? - Younger children develop their motor skills with the unique puzzle pieces. - Older children also play and learn about interesting themes. - Original themes encourage children and help them concentrate. - Extra thick and sturdy puzzle pieces. - Made in Europe from recycled cardboard.