Save money on these high-quality nickel-on-steel electric guitar strings by ordering convenient Double Decker 2-packs. Developed in conjunction with some of the worlds top artists, these unique sets deliver a smooth powerful tone that lasts while other strings have long gone dead. Superb brilliance and strength make Roto's the first choice for the professional. Rotosound follows a strict 3-point quality check code to give you consistently high-end performance from your strings of choice. •The raw materials and wire are checked for tension, wire gauge and diameter surface finish •They are checked at 3 stages of the winding process by Rotosound's Quality Assurance Team •While being packed EVERY string is hand checked for consistency of winding, color, feel and general quality