Nordstrand Fat-Stack 4 B BLK
These are a proprietary Nordstrand design. The traditional bipole magnet layout was, literally, twisted in a new direction. By rotating the pole 45 degrees for each set we have increased the size of the traditional J style coil by 50, making it wider, or fatter. This results in a larger aperature, which captures more harmonic content from the string, resulting in a fatter tone.