The DiMarzio 'The Breed' Humbucker was developed for Steve Vai to produce a more classic PAF humbucker tone than his usual favourite Evolution humbuckers which has a very modern tone.
The Breed is really a middle ground between classic and modern tones: still far hotter than a vintage voiced PAF style humbucker, The Breed balances the hot output with a slightly rounded tone that's warmer and less aggressive than the Evolution. The result is a great neck pickup to partner with a modern voiced bridge pickup for a variety of high output tones. This is the F Spaced version that is designed to fit guitars with Floyd Rose or Fender style tremolo systems.
Here's what DiMarzio say about the Breed Neck Humbucker Pickup
If you're a fan of Steve Vai, you've probably seen him playing an Ibanez Jem guitar with the word "Pogo" taped on the face. Steve wanted one of his instruments to have a fat, classic humbucker sound to contrast with the hotter, screaming Evolution-equipped guitars. These are the pickups we developed for him. The neck pickup is a bit louder and fatter-sounding than the PAF Pro pickups that Steve used on his earliest Jems. The bridge pickup is not as hot as the Evolution, but it's got a warm and punchy mid-range coupled with a fat low end that rolls off before it can get muddy. Harmonics are easy to get, and the 4-conductor wiring enables cool "notch tone" coil-splitting.