The Steinberger SST-109 strings are double-ball strings for Steinberger headless basses. These double-ball strings lock down on the bridge for incredible, Steinberger-signature stability. They also facilitate extremely fast string changes. Slap on a pair of Steinberger SST-109 double-ball strings and dial into tune using accurate micrometers rather than standard tuners - when you get in tune, you stay in tune. When you need to re-string your Steinberger, look no further than Steinberger double-ball strings like the SST-109s. Gauges .045, .065, .085, .105.