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12pcs Beginner Child or Adult Training (Transition) Practice Tennis Balls (25%-75% Slower Ball Speed)
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GAMMA Beginner Child or Adult Training (Transition) Practice Tennis Balls: Orange 60 or Green 78 Dot (25%-50% Slower Ball Speed) - 12, 36, 48, 60 Pack Sizes
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Amazon.com : CHEGIF Tennis Trainer Rebound Ball with 3 String Balls, Solo Tennis Training Equipment,Portable Tennis Practice Training Tools for Adults, Kids, Beginners Sport Exercise-Blue : Sports & Outdoors
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