Oversize 300 Piece EuroGraphics The Atom Oversize 300-Piece Puzzle. Box size: 8" x 8" x 2.37". Finished Puzzle Size: 19.25" x 26.5". The building block of our world is explained in detailed diagrams, basic scientific data and historical background. Strong high-quality puzzle pieces. Made from recycled board and printed with vegetable based ink. This superior quality puzzle will delight and educate all at the same time.