The Perfect Flat Mark: No more having to mark your ball to the side when your ball is in another golfers line while on the putting green. Golf Smoke acts as the ultimate flat mark on the green, simply tap the mark with the bottom of your putter to make it completely flat. This allows other players to putt right over your mark without it altering the ball’s roll, enhancing the overall flow of your game. Always wipe away your mark after use.