Gibson Custombucker Underwound Double black 2-conductor Unpotted Alnico 3 PickupThe regular Gibson Custombucker is standard equipment on the Gibson Custom Shops Historic Reissue guitars and beloved by players worldwide for its legendary Patent Applied For tone. Years of research and testing by Gibson engineers resulted in a formula and process that replicates the sonic magic of the original Patent Applied For humbucker pickups from the 50s. Each Custombucker uses Alnico 3 magnets for a warm, sweet tone that accurately delivers