Instruct: Classify the given Amazon review into its appropriate rating category
Query: 2 out of 4 were defective

Purchased these and 2 of the 4 had bad valve stems. I had them installed by a tire company and when they took them out of the package and tried to air them up two of the valve stems were torn at the seam. So I got to use two of the four that I originally purchased. I had the tire company purchase me two new ones that ended up being cheaper than these and they were guaranteed so if that happens they would be able to get me new ones at no additional costs. They said it happens even with new that you can get defective so use a company that stands behind the product they sell.