We 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, b5, 8.5x11", 8.5x13", 8.5x14", 11x17" are available, and guess what, 75gsm are aslo under production, there are a4, 8.5x11", 8.5x13", 8.5x14", and 11x17". we have 92 to 106 brightness. Good price.good quality.