BASS STRING SET D'Addario Pro Steels Heavy 4-string bass set, Round Wound, long scale (055 - 075 - 090 -110). The ProSteel Strings are our brightest and most magnetic strings. A special steel alloy offers us great harmonic richness and brilliance together with a depth of sound, this set of characteristics works together to obtain the much coveted "piano tone". Perfect for both finger playing and plectrum playing. ProSteel strings will give you the punch you need in the mix.