The '54s are an exact replica crafted using the most authentic materials of that era. 
They feature black vulcanized fiber flatwork (punched not laser cut), staggered alnico 3 pole pieces and coils hand wound with heavy formvar magnet wire in a scatter pattern. 
These pickups offer a bright, punchy attack with slightly lower output due to the alnico 3, making them an ideal match for tweed amplifiers. 
They're perfect for those seeking the vintage 1954 tone in a Strat build!
Notably, the middle pickup is reverse-wound/reverse-polarity for hum cancellation when used with a 5-way switch—a modern convenience preferred by many, though not historically accurate.