Plastic Sheet (or underlay sheet) is designed to let you write standing up by providing a sturdy surface underneath your page. You can also use it as a bookmark to instantly open to a certain page. The stiff material of the sheet can help you draw straight lines as if it were a ruler. The theme of the 2026 edition is THE TRAVELER\’S SPIRIT, designed to reflect the spirit of the traveler. Made of polypropyleneBack side / 5mm grid, 20cm scaleSize: H 8.3\” x W 4.3\”x D0.04\”MADE IN JAPAN WARNING: California\’s Proposition 65