D'Addario Helicore/Kaplan Combination 4/4 Size Cello Strings bring together America's favorite”the Helicore C and G, with the new Kaplan Solutions D and A. You get a cello string set that performs on a par with any cello combination offered, but at a price affordable to even novice musicians. Treat yourself to professional level performance strings”D'Addario Helicore/Kaplan Combination!