The B tuba CBB 683-4 ARION is characterized above all by its compact construction. Thanks to many years of development and adaptation to the latest trends, these instruments achieve very good quality both in terms of sound and intonation. The instrument has 4 valves, pakfong pushers, pakfong bushings and brass transducers. The converters are processed on a CNC lathe, the surface is ground on a CNC grinder. The final treatment of the surface is done by honing and fine lapping.