Pirastro Evah Pirazzi bass string set, multi-filament synthetic core with chrome winding. Orchestra gauge. Catalog #449020. Envelope design may vary from what is pictured here., , Pirastro Evah Pirazzi strings have a core made from a modern synthetic multifilament fibre. They are very intensive and powerful, with outstanding playability and exceptional response at any dynamic level, making them excellent for Soloists. They yield a complex sound, rich with overtones based on a brilliant core sound, as well as enormous projection. Evah Pirazzi strings are one of the most popular strings at the Metzler Violin Shop, among professionals, students, and amateurs alike.