We are offering double a4 copy papers. 1.base weight: 60g, 70g, 80g2.brightness: 92-106%3.thickness: 0.065-0.115mm4.moisture content: 4-6%. we are a professional manufacturer of multi-purpose copy paper.our company also offer o.e.m (original equipment manufacturer) materials: 100% wood pulp ( featuring super quality , and super brightness) quality grades: a grade: 102%-104% brightness b grade: 98%-100% brightness c grade: 94%-96% brightness substance: 70 gsm/80 gsm (i)internation standard- a4(210mm*297mm) (ii)america standard- 8.5inch*11inch (216mm*279mm) 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 opacity: 95 min cie whiteness: 167 cobb test: 27-33 g/m2 27-33 suitable for: 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 : laser printers, ink-jet printers, fax machines