GHS Strings M3045F Nickel Plated Bass Guitar Strings, Medium GHS Strings M3045F Flea Signature Series Bass Boomers, Nickel-Plated Electric Bass Strings, Long Scale, Medium (.045-.105) Flea's preferred Bass Boomers gauges. Round wound Nickel-Plated Steel on a Hex Core Flea Signature Gauges: 045-065-085-105 Packaged in GHS Foil Package