Printing industry paper specification: 148mm X 210mm (width X high)
This is a very common specification. A5 paper, that is, A type of basic size of paper folded 5 times, so a piece of A5 paper area is 2 of the basic paper area of 5 times, that is, 1/32. A5 paper is A4 half, commonly known as the 32 paper.
