I bought them Sunday evening and they arrived Tuesday with Revain Prime. I've read reviews that they come off immediately or shortly after. I followed the instructions, the metal ring is included in the cap. I have 16 inch rims so I put them on a small setting. Ease of installation. If you don't know how to put hubcaps on you shouldn't own a car, that's all I'm saying. These hubcaps on my metal rims are HERE! I tried stirring and shaking them and they were hard. I just drove to work in the morning, which takes about 30 minutes on Hwy 80. They are still fine. My only complaint is that there is a 3-4 inch gap between the hubcap and my metal rim, which worries me. My OEM rims were a tight fit on the rim but one fell off so I bought these.