The GHS Boomers Guitar Strings Light are a set of high performance Nickel plated Steel electric guitar strings with a round wound construction to deliver a bright and lively tone. With a long lasting lifespan and gauges of 09 to 42 are perfect for any electric guitar. Specifications String Type: Electric Core Material: Steel Winding Material: Nickel Plated Steel Winding Type: Round Wound Coated: No Gauge Range: 09 – 42 Gauges: 1E: .009 2B: .011 3G: .016 4D: DY24 5A: DY32 6E: DY42