http://rawvintage.com/eng/rv-sc.php We've put these pickups through the paces; Spent countless hours of reseach & development using multiple amps, pedals & many combinations. Hand assembled in sunny Southern California, the RV-60 pickups are built with Alnico 5 magnets, single Formvar Copper wire, vintage style push back cloth leads and dipped in a layers of lacquer and wax. The result is an amazingly pure sound and a clarity that perfectly compliments the natural tone and harmonics of the guitar.