This is a Peter Infeld 4/4 Violin A String with an aluminum winding, synthetic core, and is medium gauge made by Thomastik-Infeld. Peter Infeld strings are a perfect blend of power and elegance. Thanks to their balance between brilliancy and warmth, the unparalleled projection combined with their extraordinary performance characteristics makes playing the new Peter Infeld violin strings a thrilling experience that can be enjoyed every day. While using as low tension as possible, Peter Infeld violin strings manage to produce a remarkably powerful sound. The concept of �low tension� is consistent with a refined Thomastik-Infeld Vienna tradition which allows a perfect synthesis of the instrument and the strings.