Check the listing for details. D'Addario KS510 Kaplan Cello String Set - 4/4 Scale Medium Tension. Condition: New. Listed at 178.99 USD. Powerful, Warm, and Expressive Cello Strings Kaplan Cello Strings from D’Addario supplies all the beautifully rich and complex tonality that truly defines a cello’s sound. Professional cellists prefer the sound of Kaplan strings, and it’s easy to see why. Between its ability to withstand heavy bow weight and its soothing tonal diversity, these cello strings are up to the task when the stakes are the highest. This set of strings features stranded steel cores for the C and G string, which result in a warmer sound and flexible response. Meanwhile, the A and D strings feature solid steel cores for a more rigid feel and powerful projection. Together, the stranded and solid steel cores offer all the responsiveness that high-level players at Sweetwater are looking for.