http://www.railhammer.com/about.html
"Rails under the wound strings for tight clear lows: thin rails sense only a narrow section of string, reducing note smearing and muddiness. There's still plenty of low end, it's just more defined and less mushy. Even the most aggressive fast riffs and palm muting are tight, clear and cut through the mix."
"Poles under the plain strings for fat singing highs: oversize 6mm diameter poles sense a wide section of string, increasing thickness and sustain. Slow bend, double stops, or fast shred, the tone stays fluid and soulful without any thin, nasty harshness."
I think it's more or less sound...
