Designed to be the perfect combination for those who like thick bottom strings without sacrificing the capability to solo on lighter strings. 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. Roundwound nickel-plated steel light top / heavy bottom gauge, 010 013 017 030W 042W 052W