Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BOTH of my Tachikaras don't hold air!

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. Don't waste your time and your money. You will have a high probability of getting a flat ball right out of the box.