30 Sheets, 130gsm acid free cartridge paper. Daler Rowney has a worldwide reputation for the finest papers for drawing, sketching and pastel work. The coarseness or "tooth" of cartridge paper has a direct effect on an image drawn in charcoal or pencil. All Daler Rowney cartridge papers, available in pads, spirals and attractive hardback books have a specified tooth designed for clarity and definition.