The H288 Professional French Horn features a mouthpipe, branch, and bell tapers of an all-new design. Crafted with the largest open-throated bell of any Holton French horn, giving it a full, sonorous sound with rich depth that maintains its core and tone at any volume. Players looking for a horn capable of great tonal volume need look no further. Designed to be very responsive and free-blowing with excellent tonal balance. Key of Bb/F double. .468" bore; 12-1/4" solid nickel-silver, extra-large-throated, hand-hammered, detachable bell with overlap seam; newly developed mouthpipe taper with .289 venturi; tapered hand-lapped brass valve rotors with nickel-silver casings; slides are lightweight nickel-silver inside and outside with rolled bead rings.