D'Addario Zyex String Set with Aluminum D, 4/4 Scale, Medium TensionZyex violin strings are made from a new generation of synthetic material, which produce strings that are incredibly stable under drastic climatic conditions. Within a matter of hours, Zyex violin strings settle in on the instrument with a sound that is warmer than other synthetic core strings. Features Synthetic core produces a rich, warm tone Pairs well with a wide variety of instruments Broad tonal palette for musical variation Short break in time