Semi-Flat nickel wound long scale. Flatter than a half flat, but not quite as flat as a pure flatwound. Smooth to the touch, but still good intonation. Great for use with fretless basses. Gauge: Medium .045PF, .065, .080, .100 Package: 4 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.