Custom 6 string set for electric guitar from Dark Zone series that provides wide gauge span, incredible frequency response and playability, ideal for drop D or drop A tuning. Nickel on steel strings are specially designed and manufactured to provide a bright, heavy and deep tone, high performance and great longevity. All Rotosound strings are manufactured in England. Gauges: .010, .013, .018, .036w, .052w, .060w.