The EFH685GD Performance Series Geyer-Knopf Double Horn from Eastman provides you with a rich, resonant tone suited for solo and ensemble playing. Its .468" bore and detachable bell give you a broad range of dynamics and timbres to explore. The Geyer-Knopf style wrap allows for greater air flow. For serious horn players looking to expand their sonic palette, the EFH685GD Performance Series Geyer-Knopf Double Horn delivers a variety of tones at an affordable price. Experience this versatile double horn for yourself.