This is a polished Alnico 5 bar magnet, similar to the long magnets found in 1950s Gibson vintage PAF pickups. Even if you're not specifically aiming for PAF sound, try the characteristics of Alnico 5, which emphasizes treble and bass. The size is 2.5 inches, commonly known as a "long magnet" type. Please refer to the images for details. You can easily replace the magnet in your pickups that use ceramic magnets, or swap it with the Alnico 2 in a Burstbucker to transform it into a Burstbucker Pro. This is easier and more effective than replacing the entire pickup. Mixing front and rear pickups is a common technique used by professionals. "N" is marked on the north side. Magnetized. The mass has also been measured; please see the image. This is a set of two. How about using these for your own pickup creations?