Ernie Ball Cobalt Extra Slinky Bass Guitar Strings (2735) gauges 40-95 come with an all-new innovative cobalt coating, wrapped around tin plated hex shaped steel core wire. Ernie Ball Extra Slinky 2735 bass strings feature a stronger magnetic interaction between pickups and strings, which maximizes output and clarity and delivers a dynamic range way beyond that available with any other alloy. With the new Cobalt Extra Slinky bass strings you'll experience incredible harmonic response, increased low end, and crisp, clear highs, as well as a soft and silky feel that makes string bending a breeze.