Prelude cello strings are manufactured using a solid steel core. Unaffected by temperature and humidity changes, they have excellent bow response. Prelude strings have the warmest sound available in an affordable, solid steel core string design. Prelude is the educator's preferred choice for student strings due to their unique blend of warm tone, durability, and value. D'Addario strings provide superb quality at a reasonable price. Their synthetic strings are warm and rich soundingm while their steel cores are powerful.