Newly redesigned to keep these fine qualities, while adding design features from the top of the line Xeno series. Yamaha Professional model trombones have long been popular thanks to their quick and agile response, highly accurate intonation, and rich warm tone. The Pro series have kept all these fine qualities, while adding some design features from our top of the line Xeno trombones. Their broad sound has a well defined tonal core for excellent projection in all registers at any dynamics. The 630 has a medium-large bore for versatility in all musical genres. Both models have two-piece bells for a quick response while the narrow style slide and medium weight construction provides exceptional playing flexibility. Specifications Level: Professional Tenor Bore: ML: .525 Bell Diameter: 8-1/2 Shank: Small Leadpipe: Gold Brass Body Material: Yellow Brass Bell Material: Yellow Brass; Two-Piece Weight: Standard Finish: Gold Epoxy Lacquer Inner Slide: Chrome-plated nickel silver; Drawn Outer Slide: Brass; Drawn; One-piece Mouthpiece: 48 Features: Contoured Case Key of: Bb