Gauges 10-14-22-30-38-48. Sunbeam Phosphor Bronze Strings feature round core construction for remarkable sustain. The tone does not decay as it does with other phosphor bronze strings that seem to sustain in a straight line until the sound falls off. Sunbeam acoustics are musically bright, rich sounding, and very flexible. Gauges 10-14-22-30-38-48 Wonderful sustain Flexible