from the manufacturer:
All four strings have a solid steel core. The A and D strings are wound with a corrosion resistant alloy, the G string with nickel, and finally the C string is made using tungsten. The entire range offers an impressive string response and playing characteristic. In developing these strings, we have remained true to our values of high quality and consistency and manufactured a product of extraordinary value at a highly affordable price. Aurora Fractional: purpose designed, perfectly proportioned versions of our full size Aurora offering quality strings for smaller instruments.