Designed for maximum impact and power Â to get a tight, aggressive, loud sound. It incorporates a patented dual-resonance coil configuration that senses more harmonic overtones than ordinary humbuckers. Works in almost all solidbodies and most semi-hollowbodies as well. Though specifically created for Steve Vai's Ibanez Jems, it can add a lot of punch to Les Paul and similar set-neck guitars. Makes the lowest notes jump out of the amp, and feedback occurs easily with a wide range of harmonic overtones.