Brass liners

Case does... right off the top of my head.
 
I have no idea of the history but a lot of modern and historic traditional style folders have brass liners. They sure do look nice and can be machined and polished easy. I'd also hazard a guess to say that they don't make "swirlies" on the blade as much as say steel because brass is much softer.
 
Brass is also known for being a lubricant to the blade's steel it contacts, making the folder work smoothly.
 
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