DR Strings Rare- Phosphor Bronze Acoustic5 String Bass 45-125 Gauges: 45-65-85-105-125 The Rare phosphor bronze acoustic bass strings are a departure from the standard, good quality bronze string currently available, with a new, different, and stronger voice You'll notice a distinct improvement in tone, depth, and sustain with Rare phosphor strings Players who want a fatter, louder sound and a deeper bottom will appreciate the Rare phosphor tone, sound, and feel