King cage makes these elegant and simple stainless steel bottle cages in Durango Colorado.  Stainless steel is pretty much the best material to make a bottle cage out of.  It only comes from King in silver, so we have Matt, our local cerakoter, spray these with fun colors for you.  Cerakote is durable, but if you put a bottle covered in mud into any bottle cage, you'll scratch it up, and wear off whatever finish is on there, no matter how durable.  Case in point, we've seen holes worn in Ti bottle cages from grit.  And Ti is hard.  I have a pair of orange cerakoted cages on my commuter.  Been there for 5 years or so.  Finish still looks 95% as good as it did when new.  Which is pretty good I reckon.