GHS Boomer 7 String Medium Heavy Electric Guitar Set (11-64) Boomer 7 String Medium Heavy Electric Guitar Set (11-64) Modern guitarists are tuning lower and lower, adding more strings for a broader tonal spectrum Designed with the help of many "extended range" guitarists, these 7-String Boomers sets bring what you love about GHS 6 string sets into lower, uncharted territory! Gauges: 11-14-18-28-38-48-64 Modern guitarists are tuning lower and lower, adding more strings for a broader tonal spectrum Designed with the help of many "extended range" guitarists, these 7-String Boomers sets bring what you love about GHS 6 string sets into lower, uncharted territory!Gauges: 11-14-18-28-38-48-64