D'Addario J78's are designed and gauged for the larger-scale, bowl-shaped bodied mandocello. The mandocello's four double courses of strings are generally tuned C to A. Phosphor Bronze was introduced to string making by D'Addario in 1974 and has become synonymous with warm, bright, and well balanced acoustic tone. D'Addario Phosphor Bronze strings are precision wound with corrosion resistant phosphor bronze onto a carefully drawn, hexagonally shaped, high carbon steel core. The result is long lasting, bright sounding tone with excellent intonation.