yesturday i went out and bought some WF-F5-X for my 5 wt rod. is this the right line for this rod? i was on the assumption that the 5 ment 5 wieght.

one more question i also notice that each end of the line is the same diameter. what is the reasoning for this. i was under the assumption that WF line was thicker at the end of the line thaat is at your leader and thinner where it is attached to your backing. please help.....