Ernie Ball's 7-String Regular Slinky Nickel Wound Strings are intended for use with seven-string electric guitars. Each wound string features a tin-plated high-carbon steel hex core wire wrapped with a nickel-plated steel wire, while the plain strings are made of specially tempered tin-plated high-carbon steel. The resulting set provides a warm and balanced tone. This seven-string set is gauged .010 - .056.