I give them 4 1/2 stars. I lost one after about a year and a half. This was the one I broke a little bit while installing. You must mount the wire ring with the red spacers so that it fits snugly against the rim. The instructions are a bit vague, but once you understand that the tension on the wire ring holds the hubcap in place, it's easier to make the correct adjustment. Steel washers from different manufacturers vary slightly depending on where the cap is installed. The red knobs help you tighten or loosen it depending on your rim. The fit is also influenced by which groove you snap the wire ring into. After you put it on, grab it and pull to see how easy it is to remove. If it's light or heavy, you'll have an idea if it needs adjustment. Take your time and get a really tight fit. Then use the same settings for the other 3 wheels. This isn't rocket science. I bought another set to replace the lost one. Now I have 3 spares! $45 for nice looking wheels that don't cost a few hundred bucks is fine with me.