DESC: Callaway XJ Series 11 Piece Junior Set The ultimate set of clubs for junior golfers looking to jump-start their love of the game. The X Junior Set of golf clubs is small in size only. Every club comes with the same technological and innovative advancements Callaway Golf has put into its X series for adult golfers. The XJ series provides the perfect combination of performance and forgiveness so kids can play confidently and aggressively.