D'Addario XL Nickel Wound E-Bass strings are world-renowned and the preferred choice of many bassists across all genres. All XL strings are precision-wound to ensure excellent intonation and consistently high quality. Each string features a carbon steel core wrapped in nickel-plated steel, providing outstanding output and the best possible sound. Balanced Tension Sets consist of mathematically optimized string gauges that are combined for greater playing comfort and control. They offer a clear and brilliant sound, excellent intonation, and superb magnetic transfer. Scale: Long Scale. Gauge: .050, .067, .090, .120.