Ernie Ball 2816EB 5-String Slinky Flatwound Bass Strings 45-130Ernie Ball Slinky Flatwound Bass Strings combine the smooth feel of traditional flats and the modern power of Cobalts. Featuring a SuperBright Cobalt Ribbon wrap, Cobalt Underwraps 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 . 130