The guitar world’s best kept secret. Darco Electric Guitar and Bass Strings are the world’s best kept secret. With a loyal following, Darco strings offer consistent quality and tone for your electric or bass guitar. Give them a try! Darco Guitar strings are made with tin plated steel core wire and compound nickel wound wrap wire. Set: D9300 Gauge: Extra Light 9-11.5-16-24-32-42 Tension: 85.0 Package: 6 strings