Nickels are some of the most popular of the Ernie Ball Slinky guitar strings. The 2223 Nickel Super Slinky is crafted 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, producing a well-balanced tone for your guitar. All Ernie Ball strings are precision manufactured to the highest standards and the most exacting specs to assure consistency, optimum performance, and long life. Ernie Ball is a pioneer of rock and roll guitar strings. Jimmy Page, Eric Clapton, Steve Vai, and Slash are among the long list of Slinky players. Gauges: 9-11-16-24w-32-42.