Packaged in uniquely-designed sealed pouches providing unparalleled protection from the elements that cause corrosion. Prelude viola 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.