Nickel Silver Wound Cello Strings 4/4 Set Best replacement for your cello, will give sweet timbre^Fit for 4/4 size's cello^The Guitar Strings are in the material as follows: all 4 strings in Steel Core, Nickel Silver Wound^Nickel-Plated Ball End, that will help installing^The 4 string detailed is A-1st, D-2nd, G-3rd and C-4th