I'm searching for a good nickel roundwound and read the Bassplayer Wind tasting from 2004. The strings under "Pure Nickel" caught my attention, especially the "Rotosound Pure Nickel". What are they? Are they identical with the "Rotosound Swing Bass Nickel" listed under "Nickel plated steel" I couldn't find any info about any "Pure Nickels" at www.Rotosound.com. Does anyone know about these pure nickels? They seem interesting.