Larsen puzzles have a frame in which the puzzle pieces can be easily placed again and again. Each puzzle piece has its own unique shape that only fits in one place in the frame. Because the total thickness of the recycled cardboard of the Larsen puzzles is 4.4 mm thick, it will last for years. Various educational frame puzzles are available in the Larsen Educational Puzzles theme. Biology, mathematics, geography, learning to write, learning to tell the time, etc. Why Larsen? - The youngest children develop their motor skills with the unique puzzle pieces. - Older children also play and learn a lot about interesting themes. - Original themes encourage the children and help them to concentrate. - Extra thick and sturdy puzzle pieces. - Made in Europe from recycled cardboard.