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PLENTY ELASTIC STRINGS – Package includes 1 x PowerBase Tennis Trainer + Extra Elastic Strings + 1 Tennis Ball with Metal Connector. We added extra elastic strings so you can attach even 2 or 3 elastic rope to one ball. This way, you can strike as hard as you can without the strings breaking and the tennis ball will rebound fast. Also, if one of the strings breaks, you can change it immediately.
SOLO TRAINING – Our Fill & Drill builds quickness, hand-eye coordination, and stamina. Will improve your concentration, athletic ability and develop interests of sports. Easy to use and convenient for training without picking ball, and it is lightweight and portable, helpful for single person practice.