Well for starters:
- Custom deep covers in normal and tight spaced poles - mould charges of $5000 each at least.
- Custom stamped and formed then heat treated Mu-metal shield.
- The bobbin flanges look custom
- The bottom poles look to be custom, they could be off the shelf, but I've never seen mild steel pins in any of my suppliers catalogs.
- The top magnets are shorter than standard, I assume custom sized for Kinman.
- The bottom flange is made out of tougher to work with fiberglass circuitboard material complete with identification silk screening and solder mask - a nice touch.
- A high quality shielded lead, trimmed to length with the ground nicely pulled out and heat shrink applied.
There maybe or probably are more complex designs out there, but compared to a typical Strat style pickup these are a lot more work and have more exotic and expensive materials.