Ernie Ball 2223 Super Slinky Nickel Wound Electric Guitar Strings 9-42 The electric guitar strings set is portable, nice replacement or as a spare bag in an emergency.  High-precision, complete specifications, well-balanced tone, it is well choice for musical instrument player. Features: 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, producing a well-balanced tone for your guitar. These strings are precise manufactured to the highest standards and the most exacting specifications. Ensure consistency, optimum performance, and long life. Different models have different gauges specifications. Specifications: Model: 2221, 2220, 2215, 2222, 2223, 2225 (optional) Quantity:    2221/2220/2215/2222/2223/2225: 1 set (6 strings)    2220/2223: 3 sets Material: Nickel Package Weight:     2221/2220/2215/2222/2223/2225: 20g / 0.71ounces    2220/2223 (3 sets): 60g / 2.12ounces Package Size:    2221/2220/2215/2222/2223/2225: 10 * 10 * 10mm / 0.39 * 0.39 * 0.39in    2220/2223 (3 sets): 20 * 10 * 10mm / 0.79 * 0.39 * 0.39in Package List: 1 * Set of Electric Guitar Strings