Just what really determines the line poundage or breaking strength. Seen a lot of posts about people catching say a 10 pound fish on 4 pound line. I would say that if it were 4 pound and you lifted a 10 pound fish with it it was really not 4 pound breaking strength line. I think with the new lines that have came out the diameter is smaller but the breaking strength is really more than that what the actual breaking strength is. A line company could make a small diameter line that had a 20# breaking strength and just say it was 4# test and everyone would be happy with it as to say I caught a 18# fish on 4# test line when really it had a 20# test strength so to be fair or to tell the truth it should not be called 4# line.