Basic weight: 70gsm, 75gsm, 80gsm Size:a4, a3, 8.5x11", 8.5x13", 11x14" Moisture: 3.5%-4.5% Opacity:>94% Brightness: 100% wood pulp with whiteness iso101-104 Key performance: No jam in photocopy machine Leave no dust in the copy-machine Nice appearance-white and clean Nice touch-smooth and bulky No see through-print both sides 500sheets per ream, 5 reams per carton box, 7800~8400reams per container 20'