If you are taking about the collar, I use jig heads that do not have a collar and if I had one that had a collar, I would cut it off.

As for the weight, look at a 1/16 with no collar and a 1/16 with collar, both heads are the same size even though the collar adds weight to that jig, both called 1/16 and for sure the one with a collar probably is closer to 1/8 than 1/16? For sure will weigh more so anytime I am talking about a jig head it's a no collar unless it's a hair jig, then I want a collar, but not just any collar. Once I got a guy to make a mold for me by copying a head I sent him, then we talked about what I wanted. It was a thin as possible collar with a flair on the end just to control thread width, then the collar I want for keeping the hair from spinning around the shank as easy as it does. This was for a kiptail jig I was tying for some guys in Louisiana.

For me I don't like the heads to weigh too much more than it's stated weight and most do not if they have a collar! Just for kicks I have weighed every style head I have and it's a lot of different heads and some are really close, but many are not. Once example is a 1/32 Oz Pony head, in truth closer to a 1/24 Oz and it doesn't even have a collar, but if you get a mold for a 1/32 Oz pony head with collar, I bet the head size is the same which will make it even heavier!

True Original Marabou Roadrunners, 1/32 is super close, but the 1/16 is not close to 1/16, why I don't know.

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