●Genuine Wilkinson M-Series Parts, Made in China, using the new "Vari-Gauss" Technology: Bass frequencies maintain deep rattling, treble is smoother but still defined. Good alternative to 4 string jazz base for neck and bridge ●Mellow bright jazz sound from the 60s and a truly authentic vintage tone that you expect from a high-end musical instrument ●DC Resistance:8.55K(neck)/9.35K(bridge), Tolerance: 0.5K; Magnet: Arnico 5; Two Conductors: Black Wire is Grounding Wire, White Wire / Red Wire is Hot Wire ●Interstring Pitch: 55.8mm(Neck)/58mm(Bridge), Mounting Screw Hole Spacing: 38mm(Neck)/40mm(Bridge) Please check the size picture before purchase ●Package included: 2 pcs pickup and installation accessories Note: Our screws may not fit your usage, if possible, please use your own one