Seymour Duncan PA-STK1n Parallel Axis Stack Seymour Duncan PA-STK1n Parallel Axis Stack Description: Application: Single-coil-size pickup for use with Parallel Axis Trembuckers. Suitable for pop, country, jazz, blues, funk, classic rock, and heavy rock. Description: Uses our patented Stack® hum-canceling technology combined with the benefits of the Parallel Axis design (USA Patent 4,524,667). The tone is classic single-coil with sharper attack, punchier bass, and compressed dynamics. Comes with four-conductor hookup cable. Complete setup: Recommended for the middle or neck position together with any of the Parallel Axis Trembuckers in the bridge position. Guitars: Recommended for all vibrato-equipped guitars. Get your Seymour Duncan PA-STK1n Parallel Axis Stack today!