Bulk (Straight) Obligato Violin String Set by Pirastro have a core made from a modern synthetic multifilament fibre. They sound warm and full, yet have a brilliant, rich overtone spectrum and focused tone. Excellent playability and response throughout the entire dynamic range, great tone volume, and excellent tuning stability. Note: this set is not in a package for resale, it's bulk. Obligato are absolutely insensitive to variations in temperature and humidity. This bulk set contains the following straight violin strings: E-steel, A-aluminum, D- and G-silver. 4/4 size.