Line On Your Golf Ball? in Balls Posted March 9, 2019 I use a line when I have straight putt or one with little break. Also I only use a line if I'm inside 15ish feet. I don't use it for long putts. I always second guess myself on long putts, so I don't do it anymore. I really like using a line on short, straight putts. I know it's aimed correctly; All I got to do is hit it solid.