The GHS Boomers GBL light electric guitar strings 5-pack is perfect for the player looking to stock up and get a great deal. Roundwound nickel-plated steel delivers passion, power and performance. The dynamite alloy Boomers continue to be the standard for guitar strings because of their bright, long-lasting tone. Boomers are great for any style from Pop to Metal. GHS strings have been made by the highest standards since 1964. Gauges: 10-13-17-26-36-46.