Ernie Ball Comfort Slide Brass M P04288

I had hoped the brass would be thick enough for a big sustainy screech, but sadly it doesn't feel very different to my glass slide, tonewise.
However, the rubber inside makes it stay on my finger far more comfortably than any other slide I've ever had, so with enough gain on the amp (or a massive high action on my archtop), it works really well.
Very innovative, and a great idea.