The Tower of Pisa is the bell tower of the Cathedral. Although intended to stand vertically, the tower began leaning to the southeast soon due to a poorly laid foundation and loose substrate that has allowed the foundation to shift direction. The 3D puzzles are made of paper and EPS foam board, its safe and convenient to assemble without the use of any other tools or glue. No of Pieces: 30. Model Size: 10cm x 10cm x 26cm. Age: 8+ years.