B7 Paper is a standardized paper size that measures 88 mm by 125 mm, which is approximately 3.5 inches by 4.9 inches. It is part of the ISO 216 series, which includes various paper sizes commonly used around the world. B7 is often used for small booklets, notepads, and other compact printed materials. This paper size is smaller than A7 Paper, making it suitable for items that require portability and convenience. The B series is designed to provide a range of sizes that maintain proportionality, allowing for easy scaling in design and printing applications.