Why you need the E rnie Ball 2732 Slinky Cobalt Bass Guitar Strings... Engineered to maximize output and clarity, Ernie Ball Cobalt Slinky Bass Strings are one of the latest innovations in string technology. Seeking to provide guitarists and bassists with a new voice, Cobalt 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 Slinkys are also soft and silky to the touch with perfect intonation. Gauges .050, .070, .085, .105 Features • Cobalt provides a stronger magnetic relationship between pickups and strings than any other alloy previously available • Patented technology brings a new definition to "low end" capabilities Soft and silky to the touch • Element Shield Packaging Prolongs string life and keeps strings as fresh as the day they were made • Made in California, U.S.A. Featuring the finest and freshest materials.