Humbuckers were first developed in the 50's，they were with covers mostly due to the humming problem as much of the electrical equipment was poorly grounded at that time.
Later, players started removing the covers to regain the high frequencies that covers tend to mask, giving the open coil look that we are familiar with today.
A classic humbucker design: magnet, bobbin, shim, lead... although many designs appear in the later years, the classic zebra PAF design is still most popular. Original PAF features braided lead, later humbuckers began to have 4-lead conductor wire for coil-splitting installation.
As for the material we use High-Gloss ABS to mould the bobbins, it's an engineering material, differs from those used in daily products.
Coil - a wound bobbin, the generator of the humbucker power. Winding a pickup is an art, only by years of practice, can this expertise be mastered.
Screws are adjustable while slugs are fixed, both of them educe the magnetic field to the top where the strings vibrate. They are made from ferric material which is superior in conduction, usually come in nickel-plated looks.
High-end humbuckers mostly use Alnico magnets, while cost cutter pickups using ceramic substitute, these two magnet styles are distinctly different in tone. There are also different types of Alnico magnets for selection.
Maple shim is superior is tonal responding than plastic substitute, at the same time, EDM precision cut ferric spacer endows the humbucker with great sensitivity.
Nickle-silver is the preferable material in pickups' building, it can produce the clear, through sound while brass dampens the tone.
Mainly three types of hookup wires are used in humbuckers' making:
1. USA vintage braided cloth wire
2. 4-conductor wire with aluminum shield
3. Average 2-conductor wire
High-polished nickel-silver cover with nickle plated. The shining cover suggesting the clear, through tone undoubtedly.
With the cover mounted, still the making is not completed, we will wax-pot the humbucker a second run to make sure it is solid.
Finally, the beauty of the humbucker reveals in the shining cover.