Corelli CO-374-M double bass string E-4 4/4-3/4,medium, steel, tungstenCorelli CO 374 M double bass string E 4 4 4 3 4,medium, steel, tungsten These strings are the result of several innovating technologies applied to their composition and winding process. Since they have a thinner gauge, they are very flexible and very easy playing, and have a quick response. The high precision of their diameter, obtained thanks to advanced computer techniques, associated with the use of the laser, offers a perfect tuning accuracy.