BASS STRING SET D'Addario ProSteels Medium 4 String Set for Bass, Super Bright Round Wound, Long Scale (50-70-085-105). 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 work 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.