I just got my 55-02 today, and I believe it came with DR Hi-beams, I'm guessing that they're nickel by the feel and tone. I like the tone, but I'm curious about experimenting with other brands. I used TI flats on my Skyline Glaub and I loved them, so I have a 5 string set coming to try out on the 55-02. Anyone have experience with the B string on TI flats? If you play a 5 string, what strings do you use?