Nylon multi-fibre core allows multi-faceted sound properties ;Intense and clear sound with large spectrum of overtones ;Fine nuances and very easy response in all situations ;All 4 srings of the set are very well harmonised;Holds the tuning and is durable ;Suitable for all styles;Very good response;Set with A Cantiga-core, Alu wound;Tension medium 26.6kg / 58.7lbs;