... OEM service A4 copier paper.A4 brightness 92%-110%.whiteness 150-160%70/75/80GSMA4/A3/letter size/legal sizeWe ... are able to supply large quantity and best quality copy paper. For 70gsm, A3, A4, B4 ... , B5, 8.5X11", 16K, 8K are available; For 80gsm, A3, A4, B4 ... what, 75gsm are aslo under production, there are A4, 8.5X11", 8.5X13", 8.5X14", and ...