Original Jargar steel core A & D with D'Addario Helicore G & C
I have been using this combination of strings for a while and am very pleased with them. I was especially pleased with the service. I had called to ask about the availability of a cello case strap that I also wanted to order and if the free shipping would get it to me for when I needed it. The person at Concord put me on hold while she checked on the stock. And she sent the strings and strap out later that same day. I got both the strings and strap two days later.