Hand Lettering Blocks feature 80 lb. (170 gsm) white paper, developed with hand lettering artists to tailor to their needs. The paper is highly smooth with a closed surface to trap color and prevent bleeding. Brush pens, fine-tip pens, felt-tip pens and pencils glide easily across the paper. Preliminary sketches can be easily erased on the coated surface, and the tips of sensitive brush pens or paintbrushes are preserved. 25 sheets per block.