The Ravensburger earth 3D puzzle is built with 540 curved plastic pieces, engineered to securely snap together without the use of glue to form a smooth sphere. Each plastic piece features a detailed section of our earth and provides a hands-on way to explore the Globe from the comfort of your living room. Numbers and arrows are printed on the back of each piece to provide direction in the building process, and a handy reference guide is also included to see the completed map while you work. This puzzle set includes a metal display stand to hold the completed puzzle. This display stand allows you to spin your Globe on its axis, making it easy to show off the completed Globe and study its detailed surface.