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 has G and C strings with a highly flexible steel core wrapped with pure silver;C chrome steel;Warm sound character;String gauges/tension;dolce 1.06mm/5.5kp/12.1lbs;medium 1.08mm/6.0kp/13.2lbs;forte 1.10mm/6.1kp/13.4lbs;