Ernie Ball Regular Slinky Flatwound Electric Bass Strings, 50-105 GaugeThe Ernie Ball Regular Slinky Flatwound Electric 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 . 050 . 070, . 085, . 105.