Golf ball mrker function: There is only one hole (hole cup) on the green. After the players in the same group hit the ball on the green, it is bound to be in different positions and may fall on the push line between others' ball and the hole cup. In order not to affect other players to push the ball into the hole and better roll the ball, it is also necessary to pick up the ball and wipe it. Golf ball mark is used to mark the position of the ball at this time. The set only included hat clip but not included golf ball marker . There is a strong magnet in the midddle of hat clip to keep ball markers from falling off. Great Gift for Golfers: well maded, compact and handy, supplied in lot make it a great gift for golf lovers