Quality strings since 1956; Steel core, metal alloy or fiber winding; Warm, brilliant sound and durability; The “Classic” series standard strings; The A+D strings of the “Special” series are 0.01 mm thicker; The “Superior” strings are 0.02 mm thicker than “Special”; The “Silver Sound” G strings with flexible steel core and silver winding; A “Special” ; Saitenstärken dolce 0.75mm, medium 0.76mm, forte 0.77mm;