Size: B7, horizontal type.
Specifications: Horizontal writing, single color printing.
Vertical / Width: 34.6 / 49.2 inches (88 / 125 cm)
Paper quality: High quality paper
Number of sheets/100 sheets are not official JIS standard dimensions.

From the Manufacturer

Receipt Receipt B7 Horizontal Writing, 100 Sheets

Not genuine JIS standard measurements.The stamp is not genuine JIS standard measurements.Paper Quality/High Quality Sheets/100 Sheets