Strings are cryogenically treated phosphor bronze wound on a plain steel hex core. Light gauge, 012 016 024w 032w 042w 054. Sealed in corrosion-free "NitroPack" packaging. Maker says: "With feedback from players young and old, we have developed a series of strings gauged for the current needs of the musician, and then cryogenically treated them to ensure that if you're playing into the night, these sets will continue to inspire and help you share your unique voice." Same as LJ30L set.