Custom 4 round-wound string set for electric bass guitar from Nickel Wound Electric Slinky Bass series that delivers maximum clarity and punch, and features combination of Super Slinky and Regular Slinky gauges. Strings are made from nickel-plated steel (NPS) windings wrapped around tin-plated, hex-shaped steel core wire. Each bass string is manufactured for long life and maximum vibrance. Gauges: .045, .065, .085, .105.