Laserdisc next time!I use a Casino Chip - size of about a Silver Dollar. So one of the guys in our weekly group said one day when it was on his putting line -- Dont you ever carry anything smaller ? So the next time the group played I was ready for him. I marked my ball with a DVD. - he about blew a gasket. but we all laughed at him and he never said anything ever again on marking a ball.