Designed for the most demanding classical guitarists. Features a precision superior trebles design making this silver wound tie-end set our top of the line classical string. Gauge: Medium tension ball end .030, .033, .041, .028, .035, .040 Package: 6 Strings S.I.T. ( Stay In Tune )… It is our goal that you will always be in tune if you are using any of our products. S.I.T. Strings was founded on a belief that a guitar string is more than just an accessory of little importance, but rather an integral part of a musicians sound and voice. That is why, since 1980, we have been manufacturing strings one at a time, all here at the S.I.T. Strings factory in Akron, Ohio USA.