Apart from the plain mandolin E strapless sexy, these strings are made of tin – Plated Silver Steel, Flat Wound with chrome steel wire and finely polished. Their elastic, steel alloy core has a high inertia to musical vibration. On the instrument, the mandolin strings sound clear and brilliant, with no metallic twang. The strapless sexys structure has been optimised for tremolo play. This strapless sexy set responds well to fast changes of fingering. Tuning is stable and the strings are durable. - Thomastik Infeld mandolin strings are supplied in pairs, and we recommend changing strings two at a time.