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These Cobalt 7-String Regular Slinky Strings from Ernie Ball are intended for seven-string electric guitars. They feature a tin-plated high-carbon steel hex core wire wrapped with a proprietary iron-cobalt alloy wire. This proprietary cobalt alloy provides a stronger magnetic relationship between your strings and your pickups when compared to other alloys used for making strings. As such, they help facilitate for an increased output level with a wider dynamic range than other Ernie Ball strings, as well as a boosted low end, clear and crisp highs, and an enhanced overall harmonic response. This 7-string set is gauged .010 - .056.