Actually "jszymczyk" post was helpful but may be just a bit brusque. However, it is very factual in that we tend to make too much of things at times. I have a friend who builds bamboo rods, making ever component himself. He will not label his rods as to a weight specific line size. He will make a suggestion as to what he felt worked best when he lawn tested the rod but your experience my differ from his. I have two of his rods and one is a spot-on 3 weight as he suggested but the other rod I prefer with a 6wt. and he liked with a 5 weight. Different line weights react differently on each rod but to take it to the next step, even different brands of the same line weight will react differently. The only way to know for sure is to try a few different lines on a rod and when you suddenly find yourself smiling you've probably found the right one.