substance: 70/75/80GSM in weight
Size: A4(210mm* 297mm), A3(420mm*297mm),8.5*11(216*279mm), 8.5*13, (216mm*330mm) ,8.5*14(216*356),11*17(279*432mm)

There are two quality:
1. Mixed wood pulp(ordinary quality, and ordinary brightness)
2.100% wood pulp (Super quality, and super brightness)
further more, their quality also depend on its brightness
98%-102% brightness(super quality, super brightness)
106%-%108 brightness(high super quality, high super brightness)