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It depends on how you are doing it. If you are just doing a progression, then yes.

Stay on the 4k side until you are popping arm hairs, then move to the 8k side.

I was referring to the...

Its a bit cheaper to buy a combo stone than a separate 4k and 8k.

I will say it can be a bit of a pain in the arse to have to keep flipping the stone over if you are doing pyramids.

It is...

You mean like the combo ones? Norton 4k/8k. One side is 4k and the other side is 8k.

Or are you talking the natural stones where an approximate grit range is given?