A4 Hardcover exercise books come in various thicknesses measured by the number of quires they contain. A quire refers to a traditional unit of paper quantity, typically consisting of 24 or 25 sheets of paper folded together. Here's a quick description of hardcover exercise books in 1 quire, 2 quire, 3 quire and 4 quire formats:
The A4 1 quire hard cover exercise book contains a single quire of paper, usually 24 or 25 sheets, folded and bound together with a sturdy hardcover. These are compact and suitable for shorter-term or specific-purpose use, such as jotting down notes and short-term projects.
