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outdoorexercisesportRubber Tennis Ball Single Trainer Practice Partner for Beginners Features: .Tie the ball to the base by rubber band, no need to pick up the balls frequently .Pull out the plug of the base, fill the hollow with water or sand to keep the base stay on the ground steadily .Save you from the bother of the limitation of site, play or practice any place as you like .Fit for white collars, old people, youngsters, school, entertainment places, etc. Specifications: .Color: Blue + Fluor…