Thomastik Peter Infeld (Pi) Violin String Set With Platinum EThomastik offers the first platinum plated E string with this set of strings created to honor Peter Infeld. These synthetic core strings offer a powerful sound with a warm, rich tone. Immediate response and full sound are combined with quick break in time and easy tuning. These strings offer the best of all worlds for players who demand the most from their violin. This item is the PI100 set with the platinum E string. E Platinum plated steel A