Material 100% wood pulpMoisture 4.5%-5.5%Base Weight 80gsmWhiteness 102%-104%Roughness 140 ml/minThickness 110umOpacity 95%Brightness 102%-104%Packing 500 sheets per ream, 5 reams per carton(box) 8000reams per container Key performance No jam in photocopy machine No double feed Stay flat after copying Leave no dust in the copy-machine 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 Machine