Thomastik-Infeld Spirocore Tungsten Cello G StringSpirocore Cello Strings have a flexible multi wire spiral rope core of steel and are both long lasting and exceptionally responsive. They have a distinct tone color and offer a long vibration period and reduced inertia. Spirocore strings are very playable and suitable for both arco and pizzicato playing. G Tungsten wound spiral steel core Spirocore Cello Strings come with FREE shipping in 4 4 size and medium gauge unless otherwise requested.