Ernie Ball 6-string Bass Guitar string sets are round-wound for maximum clarity and serious punch. Each string is manufactured with the finest and freshest raw materials in the beautiful Coachella Valley of Southern California. The list of endorsers for Ernie Ball Slinky bass strings reads like a who's who of top selling artists. Strings have small ball ends like guitar strings, not large ball ends used on bass stings. Gauges .020 .030 .042 .054 .074 .090. Part number 2837.