MIRAPHONE Germany - Professor Dirk Hirthe with the BBb tuba #Hagen serie model 497 - 6/4 size model 496 - 5/4 size model 495 - 4/4 size more: https://www.miraphone.de/instruments/tuba/filter/m_model_no-model_495_hagen-model_496_hagen-model_497_hagen ...