Ok, not to sound like a know it all cnut, hope those aren't anodised fittings.
The majority (if not everything over -3 hose) of AN fittings are anodised aluminium.
I've only really seen steel ones for brake lines specifically (-3 hose)
Have had a bad experience with anodised fittings corroding. Since that experience I have only ever bought stainless fittings (yeah ducati performance lines are just steel) from think automotive or pritek.
@mcmyk started
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Ok, not to sound like a know it all cnut, hope those aren't anodised fittings.