Mnemosyne Japanese spiral bound note pads feature durable, black plastic covers with rounded corners, bound with twin wire spiral binding. The N192A model measures 3 inches wide by 5 inches high and has 50 sheets of perforated, fountain pen friendly paper. The lines are spaced at 5mm intervals, with each page split into 3 sections by darker lines at intervals down 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. Works equally well with ballpens, roller ball pens, and pencils.?