Flea uses the tried and true formula of the GHS Bass Boomers that the world has counted on for decades. GHS Bass Boomers are a Nickel Plated Steel wrap wire with a special combination of Stainless Steel and Nickel Plate on the low E string. The unique Boomer hex core gives this string added strength. The Red Hot Chili Peppers count on Flea to provide that hard driving bottom end and these strings are a crucial part of that signature sound. GHS Strings is the first choice for many of the worlds most renowned professionals including Jack White Pearl Jam and Green Day. All GHS products are manufactured with one objective – to provide players with products that continually exceed their expectations. Features/Specifications: String Gauges: DYB45 DYB65 DYB85 DYB105