There's not much to say about these apart from the fact that I've been extremely satisfied with the product. The grip feels great and the matte black finish looks great.
I bought these to replace the stock pot covers on my Ibanez and I'm very happy with the result. They sit on top of the CTS pots perfectly. They weigh a lot heavier than I expected, which suggests quality - still, nothing crazy, just heavier than some cheap plastic ones.
In a nutshell, if you're considering of purchasing pot covers and you want them to be made of metal, have a nice grip and for them to be (matte) black, look no further, for you've found the perfect match.