D'Addario J1010-44M cello string set 4/4, medium, steel, compound woundD'Addario J1010 44M cello string set 4 4, medium, steel, compound wound A solid steel core string that is excellent for students and amateur players. A durable string that is not affected by temperature and humidity changes. Prelude strings are bright, without the shrill sound of traditional steel strings, and are easy to bow.