Each year Titleist runs a promo on their Pro V1 & Pro V1x golf balls. When you purchase 3 dozen your receive your 4th dozen FREE. Along with this promo you also have the option to personalize the balls and choose any number you wish. The Titleist Pro V1 continues to be the #1 ball in golf, why not play what the pro's play. To place you order contact the pro shop today!