On my car (all black paint), while the wheels are a mix of silver (not sure the metal, but not shiny chrome) and black. The valve stems are black rubber. They were capped with green caps (car came that way - just bought it used a few weeks ago), and was missing about half of the caps.So assuming they were green BECAUSE they had been filled with nitrogen, and if not, soon will be), I wanted a set of caps that did not clash, but were still informative.These fit the bill exactly. The lower overall rating was that it would have been better to make it a set of 5 (one for the spare) or 6 (in case one got lost). But at this price, I will probably just buy a second set.