Big fat Alnico Magnets- Vintage style coil windings- WHITE Delrin bobbins, Nickel plated polepieces, baseplate engraved with our famous GFS logo- Coil tappable wiring- These are high quality, wax potted pickups. In fact- they're vacuum impregnated- so I can stand in front of my SLO-100 with NO SQUEAL. This is a very round and warm ALNICO magnet humbucker pickup. Bridge pickups are full, fat and HUGE, Neck pickups are loud and bluesy- A terrific set. Wound FAT and HOT- Bridge is 14k Neck 10K.