Scaled to fit 1/4 size cello with a playing length of 21 1/2 inches (545mm) medium tension strings are optimized to the needs of a majority of players. This C string is nickel wound. 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.