The hard shell sketchbooks come as a set of two dark brown hardcover books, each with dimensions of 7.5×5.1 inches and containing 50 sheets of 100gsm acid-free paper. These sketchbooks are designed for those who value convenience and portability in their artistic endeavors. The acid-free paper ensures that your artwork's colors remain bright, compatible with a variety of dry media. These books are not just for sketching; they can also serve as scrapbooks, work records, or study notes, offering flexibility in how you capture your thoughts and ideas. The wire binding allows for smooth page turning, and the hardcover helps maintain the shape of the inner pages, ensuring your work stays intact.