(3) RWRP [Singlecoils] The reverse construction of the middle pickup (winding direction and magnetic field) minimizes the noise in switch positions 2 and 4.
(2) Staggering [ST Singlecoils]
(4) Cover [Humbucker] Nowaxx only uses german silver humbucker covers. Chrome and nickel german-silver-covers have the best corrosion resistance. You get the best sound (dynamics and clarity) with uncoated covers.