I just went through the international security at PVG yesterday and my very small pair of nail scissors (blades much smaller than 4 inches) were confiscated by the Chinese luggage inspection after my bag was subjected to secondary screening after going through the x-ray machine. I speak near-fluent Mandarin and was unable to argue for their safe passage, even though I have flown with them inside and out of China many times before. I'm not sure if this is a new Chinese policy or just a one-off, but I thought I'd mention it here.