Great product. cant mark golf balls with anything else.

This product works exactly how you would hope, having the line on the ball has immediately improved my putting. Focusing on making a better stroke and having the line roll end over end rather than 34;wobble34; off center is a great thought when putting. The only reason I didn't give it a full 5 stars is because the picture is of a green alignment-tool and sharpie, however when it was delivered they were red. If there are multiple colors they should point that out or let you choose. Not a huge deal, but I don't like when I get something other than what is pictured.

Simple. Effective. Glad I purchased this

What can you say about this other than it properly marks my ball

The Line-M-Up golf tool is a simple template for placing a line on a golf ball. The line aids the golfer during putting. A number of companies put out a similar tool, but I find this one more sturdy than the one I last had, which broke.The curved plastic template snaps over the golf ball and there are three parallel slits in it. Using the slits as a guide, just use the included Sharpie marker to make accurate lines on the ball. This is pretty much impossible to do freehand due to the curvature of the ball.It comes in different colors, but I chose the clear plastic so I could line up the template with the label on the side of the ball. That's recommended for a roll that's more true.I see many golfers using a line on their golf balls for putting. This is recommended for better alignment by many golf instructors. I'm glad I found the Line-M-Up tool for this.The product is made by Greenkeepers of Philadelphia, PA.