Famous for first class strings since 1956;Steel core strings, wrapped with thin threads of pure or alloyed metal ;Warm, brilliant tone and long durability;"Classic"series are the standard strings;"Silver Sound" series G string highly flexible steel core pure silver wound top layer;D Chrome Steel;String gauges/tension: ;Dolce 0.71mm/5.7kp/12.5lbs;Medium 0.72mm/6.0kp/13.2lbs;Forte 0.73mm/6.1kp/13.4lbs;