they aren't labeled to the grit. the first one I received is a combo 1k and 6k I assume the "yellow side" is the 6k AND THE other is the 6 k which is brownish pink or yellow. Am I correct? I also got a 12k from srd and 5k blue as well as 3K/8K WHICH IS BROWN AND YELLOW. THE 1K 6K DOESNT SEEM TO BE NANIWA ITS A KING
WHICH SIDE IS 1K AND WHICH SIDE IS 1K? I CAN TELL BY THE GRIT BUT WANTED TO BE SURE