The NEW GHS Coated Boomers feature a clear, thin coating on each string for long lasting tone & protection against breakage. Roundwound nickel-plated steel delivers passion, power and performance. The dynamite alloy Boomers continue to be the standard to play by. The bright, long-lasting tone continues to be THE POWER STRING. GHS has made the highest quality strings since 1964. The choice of numerous guitar greats. Hermetically sealed package for optimum freshness!