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Title: Went completely flat in a few hours.
Review: A few hours after filling it up it was completely flat. Unfortunately, I missed the return window, which was only 1 month. I must be a slow learner, since I received this same model of ball last year for Christmas, and the same thing happened. I had figured Tachikara is reputable company and my first flat ball had to be a fluke. Nope. I got the exact same ball with the exact same results. I wetted the surface of both balls, and both of them had air leaking out of nearly every seam. Don't waste your time and your money. You will have a high probability of getting a flat ball right out of the box.
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