FLATWOUND 5-STRING ELECTRIC BASS STRINGS - 45-130 GAUGE ERNIE BALL FLATWOUND ELECTRIC BASS STRINGS USE FLAT STAINLESS STEEL WIRE WRAPPED AROUND A HEX SHAPED TIN PLATED STEEL CORE. PROVIDES A SMOOTH FEEL AND MELLOW SOUND. GAUGES .045, .065, .080, .100 .130