Here is a VMI 3302 BBb tuba. It is a 4/4 size with four pistons and one rotor. I am the second owner and bought this horn in 2010. I have won solo compitions, and my current symphony job with this tuba and it has gotten me into multiple music programs. I am regretfully selling this horn to move to a CC tuba with rotary valves as I am planning on switching to an all rotary set up. I want this tuba to be in the hands of someone who will take care of it. If you want an amazing BBb tuba this horn will fit the bill and exceed expectations.