XL Nickel Wound, D'Addario's most popular electric guitar strings, are precision wound with nickel plated steel onto a high carbon hexagonal steel core. The result is strings with long lasting, distinctive bright tone and excellent intonation, highly versatile and ideal for the widest variety of guitars and playing styles. EXL130+, offers a slight variation in tension, including an 8.5 gauge high E and is a great choice for players seeking to gradually step up to heavier gauges. It offers the same combination of great tone, flexibility and long life as its siblings in the XL range and like all D'Addario guitar strings, comes in environmentally friendly corrosion resistant packaging for freshness in every set.