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Description from Woodbrass :
Yamaha alto trombones have gained a formidable reputation as the preferred instrument of many of the world s leading soloists.Characterized by a clear, elegant tone and superb playability, the YSL-671 features a dual bore design for improved response and intonation. It has already become the standard alto for many soloists. * Yellow-brass bell: 181.8mm (7-1/8) * Bore: 11.95-12.45mm (0.470-0.490) * Gold lacquer finish * Mouthpiece: 48A