Gamma First Set Kit, Assorted Ideal starter kit for any child learning to play tennis. Contains: (1) 18 First Set Jr. Net, (2) Revolution Foam Balls, (12) Quick Kids 36 Tennis Balls, (12) Court Marker Lines, (5) Disc Cones, and the First Set Program Guide. USTA approved for QuickStart Tennis. USTA approved for QuickStart Tennis.