Pro Putt 360 - Golf Ball Liners / Practice targets The only Ball Liner that lets you easily draw Alignment Lines around the entire ball. Locks in place so the ball does not slip when drawing a line or adding ID Marks It is the perfect practice putting aid. It narrows putting focus by presenting a smaller target for the golfer, like the small 3 inch holes sometimes put into practice greens for that purpose Gives feedback on every putt. The PP360 is a chipping target and perfect for chipping practice, like Rory Sabbatini does on You Tube Additional Uses: Keep grips off wet turf with the grip on the edge in tall grass or in the PP360 on the green. Use it as a ball mark for long putts.