Brushed brass. Polished is so gaudy. I've thought about anodising the aluminium, but the problem is finding a company that can give it the exact finish I would like (it's easy for it to go all bright neon-canary yellow and that would be horrendous), unless I get my own kit and start experimenting with dyes. And to be honest, I like the character of bare metals. So I will probably leave it as it is but wax it to protect it from oxidation. For brass I intend to use renaissance wax --a time-honoured approach. I also have wax from my own beehives.