Mnemosyne Japanese spiral bound note pads feature durable, black plastic covers with rounded corners, bound with twin wire spiral binding. The N193A model measures approximately 2.25 inches wide by 4.25 inches high and has 50 sheets of perforated, fountain pen friendly paper. The lines are spaced at 5mm intervals, with each page split in half by darker lines across the top, center, and bottom of the page. Paper is 80 GSM- lightweight, but heavy enough to take most fountain pen inks without bleed-through. The paper is properly sized for water-based inks so that no feathering occurs. Each Mnemosyne pad has a yellow blotter page inside the front cover- once you finish with the top page, and remove it using the perforation, you are ready with the blotter for your next page of notes. The paper in Mnemosyne notebooks works equally well with all types of writing instruments- ballpens, roller ball pens, pencils, and highlighters.?