DR Handmade Strings RPB5-45 5 Acoustic Bass Strings Medium - 45-125Phosphor Bronze Acoustic Bass Strings wound on Round Cores Rare phosphor bronze bass strings are recently available from DR. Rare acoustic bass strings are constructed on around core combining winding techniques developed for DR's long lasting Lo Rider bass strings and DR's rich, ringing Rare phosphor bronze acoustic guitar strings. RPB5 45 Medium 5's 45, 65, 85, 105, 125