Check the listing for details. 2 Pcs 2.8" Golf Ball Line Marker Tool Golf Ball Alignment Marking Tool, Blue. Color: Blue, Condition: New. Listed at 16.58 USD. A golf ball liner is a common tool for drawing lines on golf balls. According to the lines, you can check alignment for swing or putting to make sure you will hole in one. It is widely used as a golf ball marking tool and accessory.SpecificationColor: BlueMaterial: PlasticMarker Tool Length: 7 cm / 2.76 InchPacking List: 2 Pcs x Golf Ball Alignment Marking ToolAdvantageThe golf ball liner is made of plastic, which is durable. It allows you to efficiently mark all your golf balls, making it easy to identify which ones belong to you while playing. This is particularly useful when playing with others who may have similar-looking golf balls. Drawing lines with different colored pens is easier to recognize than drawing arrow marks on a golf ball.InstructionEasy to use.