They are about the size of the wood fragments in cedar landscaping chips, without the soft mushy stuff. The ones you buy are mashed into splintery bits.
One note: applewood chips (Luhr Jensen brand) are mixed with alder chips making them good for poultry, fish, pork, etc. I don't know how the straight apple wood work, should be good though.
I don't think we have alder out here? It's everywhere out west.