Super Slinky Flatwound Electric Bass Strings, 45-100 GaugeErnie 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.