La Bella Steinberger ST942 V1 TransTrem; String Set for Electric Guitar; Extra Light Tension; Round Wound; The “ST” series was developed for Version #1 TransTrems; These Tremolos require a special threaded Ball End that screws into the Tremolo Block to adjust the TT Tuning calibration.; Winding material: Stainless Steel; Gauges: .009, .011, .016, .024w, .032w, .042w; Made in USA; Note: Not suitable for “S”, “R” or “Version #2 TransTrem” Tremolo systems