Solve this 500 Piece Holiday puzzle of Polar Express Book Box by MasterPieces Puzzle Co. Your classic favorite Polar Express train story inside a keepsake book box with magnetic closure. The finished Polar Express train puzzle measures 21 X 15 (in inches) when assembled. All of MasterPieces puzzles are constructed of thick puzzle board made of recycled materials, random shaped and fully interlocking. For ages 13 and up. All puzzles are also environmentally friendly, using recycled materials in production and packaging as well as biodegradable storage bags and soy based inks.