Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great ball - missing the plug though

I should have heeded the warnings of other reviewers. When this ball arrived, I was pleasantly surprised to find that it arrived with no odor whatsoever. I recently ordered another brand and it smelled much worse for approximately three days.Unfortunately, there is no plug with this ball. You'll have to return it, exchange it, contact the manufacturer, or use a plug from a different exercise ball (if you have one that you don't mind deflating for a bit).I bought the 75 centimeter ball to use as a replacement for my desk chair. I am 5'6 and research told me that a 65 centimeter ball would be the right size. It was too small. This ball, which currently inflates to about 70 centimeters, is just about perfect for that use.