Why you need DR MR5-45 Hi-Beam Stainless Steel Medium 5-String Bass Strings These strings are constructed around a round core that create higher flexibility and more durability. DR has always bridged together more modern and cutting edge material with more vintage and traditinal craftmanship which allowed these strings for a greater tone and longer lifespan. Features • Guage .045, .065, .085, .105, .125 • Stainless Steel • Round wound