B series paper sizes and dimensions are defined by the ISO 216 international paper size standard. The B series is not commonly used compare to A series. The area of B series sheets is the geometric mean of successive A series sheets. B0 is 1 metre wide, and other sizes in the B series are a half, a quarter or further fractions of a metre wide. B series is not used commonly in offices so it is used only for a special purposes. B series is mostly used for posters, books, envelopes and passports.