Gauges: 10-13-17-36-52-60. Super-heavy bottom for power chords and light high end for ripping leads. The Heavyweight Boomers continue to be the standard electric guitar strings to play on. The bright, long-lasting tone continues to be THE POWER STRING. The perfect sound for all your guitar explosions. GHS has made the highest quality guitar strings since 1964. The choice of numerous guitar greats!