Ernie Ball Slinky Flatwound Bass Strings combine the smooth feel of traditional flats and the power of Cobalt. Featuring a Super Bright Cobalt ribbon wrap, Cobalt under wraps and optimal hex-core to wrap ratio, the new Flatwound Bass strings are the first flat that actually feels like a flat and sounds like a round. Gauges .045, .065, .080, .100. Features: Super bright cobalt ribbon offers superior sheen and feel Cobalt under wraps delivers added clarity and output Optimal core to wrap ratio ensures comfortable tension and playability Element shield packaging prolongs string life and keeps strings as fresh as the day they were made Featuring the finest and freshest material