I called Huddleston this morning to ask the question. How do you tell the difference in the ROF after the bait is out of the packaging? Sounds like there is no real straight forward answer. I was told the 6, 68, 8, and there weedless versions along with the hudd gills are all different as far as there internals and not one is alike. They told me that the 5 and a 12 on the tail is for the customer to mark once opened. Sounds like the hot paper clip idea for making them might be a good option.