I know I have looked everywhere and so far I can't find any information. They are located here in So. Cal. so maybe if I keep digging I will find out the diameter of this line. On another note I found a cool measuring mat on Amazon just like LedHed has. As soon as I get it in the mail I will start using it to measure my catches. Being some what new to this bluegill fishing I actually didn't realize how fortunate I was to be sitting on a trophy blue gill lake. I am enjoying this type of fishing every bit as much as bass angling.