Unweighted size 8, 27 feet was my best with the same rod and line. Average was about 20 feet. Not the best but around here I can see the panfish I am targetting most of the time so that is plenty far for me to cast. Doesn't mean I can catch them but I can see them!

I can not say ow well they will work on light weight rods but I can fly fish with them easily on an 8 weight for steelhead. I have never tried them on my 5 weight. Will have to give it a try and see if I can cast them at all.

The material gives some weight to them. If I had an accurate scale I would weigh them unweighted and weighted to see what they come out at. The best I could do is to use a makeshift balance and compare them to known weights.