The Line M-Up is the original and best ball alignment tool. It comes with a Sharpie fine point marker pen to precisely mark your ball with an alignment line. This line will help you to target holes better to improve stroke and green reading, as well as alignment.
The Line M-Up Ball Marking Features:
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Alignment Tool
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Sharpie Fine Point Marker
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Improves Aim / Stroke / Green Reading
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Precision Line Marking