42 gauge is the most common wire used in pickup manufacturing. This and other common building techiniques are covered in this clip. Also, Evan expalins why Seymour Duncan goes through great lengths to use the same bobbin material used in many classic pickups. Perhaps the coolest part of this video - check out the original winder once owned by Gibson and used for early PAF humbuckers. SD has the winder now and still uses it today.