The traditional P-90 has a sound that is more powerful than a single coil, but is cleaner and clearer than a humbucker. However, the physical shape of a P-90 makes it so it won’t fit in most guitars without modification. The Phat Cat Set solves this, by putting a traditional P-90 under a humbucker cover so more people could access the beefed-up single coil sound. In this set, the bridge pickup is RW/RP so it cancels hum when both pickups are used together.