LineMUp Pro Ball Tool... Better Putting Through Better Alignment! A performance driven product for the serious golfer. Use as a visual playing or training aid. Helps establish an aim line so you are free to concentrate on stroke and speed. Fine Tune Golf LineMUp Pro Ball Tools feature: Made of polycarbonate for flexibility Fits any regulation size ball Precision multiple marking options Helps improve aim, stroke and green reading abilities Hit more fairways Sink more putts Identifies your ball Conforms to USGA rules Legal in competition Comes with an ultra fine Sharpie matching marker The marker comes attached for easy storage and convenience Colors: Black A* Blue A* Orange Fine Tune Golf LineMUp Pro Ball Tool...The Science Of Sport!