Golf Pin Balls Putting Aid Pin Balls Golf Putting Trainer Designed to teach the player how to square the putter at impact, these challenging shiny balls are so challenging standard golf balls will be easy to putt by comparison. Because the balls are joined in the middle, they will not roll straight unless perfectly struck. If you have any questions about this product or would like to order by phone, please call us Toll Free at 888-733-8383. We look forward to hearing from you!