The Model 66-S 4/4 EEb Side Action Concert Tuba easily demonstrates the wonder qualities Kanstul has acheived: grand tone, perfect intonation, easy blowing qualities, smooth valve action and expert workmanship. Features include a special alloy bell, 5 side action valves, hand lapped Monel pistons, and a removable valve section for easy cleaning and maintainance. Case and mouthpiece sold separately.