Famous for first-class strings since 1956;Steel core string wound with thin filaments of pure or alloyed metal;Warm, brilliant tone and long life;"Classic" Series - standard strings;"Special" Series has 0.01 mm thicker A+D strings;"Superior" Series is 0.02 mm thicker than "Special";"Silver Sound" Series has G and C strings made of a highly flexible steel core with a top coil of pure silver;G "Classic" Chrome steel;String tension: dolce 1.16mm/13.0kp/28.6lbs, medium 1.17mm/13.4kp/29.5lbs, forte 1.18mm/13.6kp/29.9lbs;dolce 1.16mm/13.0kp/28.6lbs;medium 1.17mm/13.4kp/29.5lbs;forte 1.18mm/13.6kp/29.9lbs;