Ernie Ball Cobalt Slinky Electric Guitar String provides an extended dynamic range, incredible harmonic response, increased low end and crisp, clear highs. Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy. Cobalt slinky guitar strings are also soft and silky to the touch, making string bending a breeze. Gauges .008, .011, .014, .022, .030, .038.