Ernie Ball Baritone Slinkys are round-wound for maximum clarity and serious punch. These sets are optimal for A-A or B-B tuning combinations and are a perfect match for they hybrid baritone instruments. Strings have small ball ends like guitar strings, not the large ball ends used on bass sets. The list of endorsers for Ernie Ball Slinky bass strings reads like a who's who of today's top selling artists. Gauges .013, .018p,0.03,0.044,0.056,0.072