This set of four Stringjoy Ranger Series bass guitar strings feature stainless-steel winding around a hex-shaped high-carbon-steel core, resulting in piano-like resonance packed with rich overtones, tight trebles and full basses. These strings are only made in small batches before every last one is carefully inspected on location in Nashville, Tennessee. After all of that quality control, these bass strings don't just assure you of improved tuning stability, but improved tuning stability for their entire lifespan. The Stringjoy Ranger B4L Medium pack comes with gauges .050 to .105.