GHS Strings LJ30L Signature Bronze, Cryogenically Treated Acoustic Guitar, Light (.012-.054) GHS Premium Acoustic String Set. Brass plated core wires and plain singles. Featuring Nitro-Pack singles, guaranteed to be fresh from the factory! Cryogenically Treated Copper-Tin-Phosphor Alloy on a Hex Core Long-lasting, rich, bright tone. Light (.012- .016. -024 - .032 - .042. - .054)