What are the tuning posts made of...

[Ken Baker]

...on a Bongo?

They appear to be non-ferrous, seeing as how a magnet isn't attracted to them. OTOH, they are polished far shinier than I would normally expect for polished aluminum.

TIA!

Ken...

 

[strummer]

Erm, metal

 

[Aussie Mark]

My guess is that it's nickel-based stainless steel, which is non-magnetic.