Brass nut. I installed it with promises of magical tone improvements, which mostly turned out to be claptrap. However, it has one very useful effect: open notes sound as strong and sustain the same as fretted notes, so I don't have to worry about finding the 5th fret when diving down to a D or A (for example).
I love it - would have either that or a zero fret on all of my fretted instruments if I could!
I love it - would have either that or a zero fret on all of my fretted instruments if I could!