It's two reverse wound coils of 38 AWG magnet wire (one over and one under the strings) … inside a uniform dipole field produced by a Halbach Array of Neodymium-Iron-Boron magnets … encased in a Faraday Cage …
Main Features:
* Cylindrical Halbach Array provides a homogeneous field across the air gap and establishes the reverse polarity orientation needed by the coils.
* An adjustable air gap … Uniformly increase/decrease the magnetic flux density surrounding the strings.
* Over and under “In-Phase” coils provide maximum constructive interference.
* Reverse wound coils inside the grounded “Faraday Cage” housing … virtually eliminates electromagnetic interference.
This Particular Unit:
* 1.8 k Ohm coils … 3.6 k Ohm in full Humbucking mode
* Air Gap Flux Density: 1250 gauss
* 3.25” sensing length
* Black Wrinkle Powder Coating
* 4.5” long X 1.5” wide X 1.125” tall
* Mounting plate: 4.5” X 1.5” X 0.125”
* Distance from strings to Top of Unit: 0.625”
This particular unit is very, very powerful ...
... nothing in this house is even in the same ball park ... I'll probably wind each coil with 1000 turns less from now on.
And although it's a tad too strong ... it is dead quiet ... even knocking on the unit or steel's body doesn't produce loud thumps ...
And it's bright enough to peal paint off the wall when the treble is elevated ...
The Halbach Array was real hard to put together ... and having the over and under coils was an unusual thought ... but it works very well ...
I'll try and have my girls help me make a video on the iPad ... comparing it with my Sierra w/Alumitone and my prewar Ricky A25 (my best Rick) ... but I'm not much of a player ... so it might be just strums and harmonics ...
.... The only thing this has in common with that pickup is it's string through and it's rectangular 
... using a Halbach array and dual air coils is definitely thinking inside the box 
... I look forward to hearing how she sounds.
... four holes were drilled in the mounting plate and countersunk. Four #6-32 screws w/ springs and knurl nuts were then used to secure the unit to the steel.
