Sa-Ling-Key! Ernie Ball Cobalt Slinky Electric Bass Guitar Strings provide 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 previously available. Cobalt Slinky bass guitar strings are also soft and silky to the touch, making string bending a breeze. Gauges .040, .060, .070, .095 • MFSKU P02735 • UPC 749699127352