Earthwood Phosphor Bronze strings are made from a winding wire consisting of 92% copper, 7.7% tin, and 0.3% phosphorus around a tinned hexagonal steel core. Their color is a bright orange-gold, and their tone is soft, bell-like, and very clear. The strings come in the following gauges: 0.009, 0.012, 0.020w, 0.026, 0.036, 0.046.