From the the guys at BKP:
The sound of a hand-wound late '50s vintage P90 is unmistakable, as is the tone of those early LP Jr and LP Special playing blues and rock guitarists; the Nantucket 90 continues that legacy.
Arguably the ultimate pickup with the best tonal elements of humbuckers and single coils, the P90 single coil has a distinct and gutsy tone all of its own. Scatter-wound by hand with 42AWG plain enamel wire and using sand cast, vintage cut Alnico V magnets, the tone is raw and in-your-face. The wide, squat coil creates a fatter tone compared to a Strat or Tele coil, while the twin magnet design lends all the power of a humbucker. Low notes are solid and tight while the upper mids really grind, but they never sound harsh; just fat and chunky. High notes can really sing and with a slightly breaking-up tube amp, wonderful harmonic feedback is possible. A touch sensitive dynamic and the ability to clean up well as the volume is backed off, the Nantucket 90 really does lend itself to a huge range of playing styles.
My Personal notes:
The pick ups are incredibly clear and very detailed on the high end, bottom end is not its main focus. Note definition and separation are the strongest points so if you are looking to have your playing clearly heard by the audience and yourself, without too much interference from too much gain from the pickups themselves, those are the pickups for you.