Hey, can anyone tell me about how abrasive or non-abrasive the blue steel strings are on the frets and fingerboard. I've tried the Nickel Blue Steels, but I really love the tone of Stainless Steel. The only thing is, Stainless Steel is abrasive on the frets. Can anyone tell me their experiences with the SS Blue Steel strings on the frets and fingerboard? I have a Yamaha RBX series 4-String with a rosewood fingerboard, and a Carvin B4 with an ebony fingerboard.