Roundwound nickel-plated steel Produced to the highest specifications to maintain consistency, optimum performance, and long life. The wound strings are made from nickel plated steel wire wrapped around a hex shaped steel core wire. The plain strings are made of specially tempered tin plated high carbon steel to provide a well balanced tone. Extra light gauge, 008/008 010/010 008/014 011/024W 017/32W 022W/040W