I just bought these and put them on my SX SPB62 bass. I wanted to give some rounds a try but I like flatwounds too much. They was on my bass for maybe 30 minutes. I can also give you the stock SX strings if you want them...no cost. $12 shipped to lower 48 states Thanks, Steve GHS Bass Boomers roundwound strings feature a nickel-plated steel wrap and provide brilliance, volume, sustain, and strength, unlike any other electric bass string. Model M3045X medium-gauge string set fits 34"-36"-scale bass guitars. Gauges 45-105.