Ernie Ball M‎-Steel ‎(‎maraging steel‎)‎ strings are made of a superalloy used in aerospace and defense applications‎.‎ The super cobalt alloy wraps around the maraging steel hex core wire to give you a rich‎,‎ full tone‎.‎ You‎'‎ll feel a more powerful low‎-end response and hear increased output from this set of strings in the popular ‎.‎009‎-‎.‎042 Super Slinky gauge combinations‎.‎Set of 6 stringsFor electric solidbody guitar or electric hollow and semi‎-hollow bodied guitarsGauges Gauges ‎.‎009‎,‎ ‎.‎011‎,‎ ‎.‎016‎,‎ ‎.‎024w‎,‎ ‎.‎032‎,‎ ‎.‎042 ‎- Super SlinkyRound wound Super Cobalt Alloy around Maraging Steel hex core wire