Cello Stainless Tailpiece Adjuster Wire, Wittner, 4/4 Stainless Steel Tailpiece Wire for Cello, fits snuggly to endbutton and saddle, doesn't stretch, insusceptible to changing climate conditions, evidently improves the sound, violin can be played instantly after installation of tailpiece wire, unlike nylon tailgute there is no additional stretching that would require a re-tuning of the instrument. 4/4-3/4 size.