Item :Copy Paper Material :100% wood pulp Size :A4, Letter size(8.5â?�x11â?�), 8.5â?�x13â?�,Legal size(8.5â?�x14â?�) Base Weight: 70gsm Whiteness: 102-104% Packing: 500 sheets per ream, 5 reams per carton(box) No jam in photocopy machine No double feed Stay flat after copying Leave no dust in the copy-machinev Nice appearance-white and clean Nice touch-smooth and bulky No see through-print both sides Been developed for: Photocopy Machines, Laser Printers, Ink-jet Printers, Fax Machines Technical Data: Moisture 3.5%-4.5%, Thickness: 103-110 um Surface roughness TS ml/min: 75-175 Surface roughness BS ml/min: 100-200 Bending stiffness MD: >110 Mn Bending stiffness CD: >50 Mn CIE whiteness: 167 vCobb Test: 27-33 g/m2 27-33