This 36-pack of 40" x 650' rolls of HP 20 lb Bond Paper with ColorPRO Technology is compatible with HP PageWide XL printers and designed for high productivity environments. The rolls feature a 3" core, basis weight of 75 gsm, and thickness of 4 mil. The ColorPRO aspect of the paper refers to additives that interact with pigment inks to keep lines sharp and increase contrast. With a normal matte finish, the paper dries near-instantly and has a brightness of 92% and opacity of 88%.