The Conn 88HYO Symphony trombone features a .547" primary bore combined with a .562" bore open wrap F attachment that offers outstanding clarity and projection with an open feel. The chrome plated nickel silver inner handslide tubes provide the ideal surface for smooth and quick handslide action. The yellow brass material used in the professional bell produces a rich yet lively sound with a quick response. The clear lacquer finish adds a subtle warmth overall. The Conn 88HYO professional trombone is ideal for both symphonic and solo performance.