The longer lasting high performance Olympia HQ Electric Nickel Wound Bass Guitar String Set has four strings and are manufactured from the finest Nickel plated steel wire wrapped around a platinum hexagonal steel core wire, producing a higher magnetic response and provide brilliance, volume, sustain and strength. Specifications: Long Scale String Gauges: G – 1st .040 Nickel Wound D – 2nd .060 Nickel Wound A – 3rd .075 Nickel Wound E – 4th .095 Nickel Wound