Continued. - It's been 6 months since I bought them. One doesn't work. I don't have to send it back anyway and I still have to spend the money to take the tire off and replace the part. I can't tell if the manufacturer checks or cares about our reviews. Don't buy TPS worked. The valve stem didn't work at all. I had to use native stems. With all the tires removed and the rims blown out, it wasn't great, but we figured it out.