Ernie Ball P02813 Cobalt Hybrid Slinky Flatwound Electric Bass Strings - 45-105Ernie Ball P02813 Cobalt Hybrid Slinky Flatwound Electric Bass Strings 45 105 Ernie Ball P02813 Cobalt Hybrid Slinky Flatwound Electric Bass Strings 45 105 Ernie Ball 2813 Slinky Flatwound Bass Strings are a revolutionary design that combines the smooth feel of traditional flats with the power of Cobalt. These strings feature a SuperBright Cobalt ribbon wrap, Cobalt underwraps, and an optimal hex core to wrap ratio, making them the first flats that