My mum needed two valve covers for her car and I found this set of 4 which were very reasonably priced as an add on item. I had other items to order so it made sense to buy this one instead of going to the store and looking for them as we were in no rush. These baseball caps come in packs of four and are made in China from black plastic. They measure just under 1/2 inch long and 3/8 inch in diameter. They have grooves for which it is convenient to hold them. These are just basic valve caps and don't appear to be the best quality but for the price it's a bargain and they do a good job of replacing missing valve caps. My mom has a 2010 Ford Escape and they fit great, but they have to fit any stock valve stem. Overall this is a good buy if you need valve covers and don't want to pay a lot of money. My mom only needed two, so she has two spares just in case. We are satisfied with the price and quality and recommend them if you need valve caps!