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;D Chrome Steel;Warm and round sound;String gauge/tension: ;Dolce 0.72mm/7.6kp/16.7lbs;Medium 0.73mm/8.1kp/17.8lbs;Forte 0.74mm/8.4kp/18.5lbs;