Willson 2950 TA Euphonium in Bb, compensating system, 4 valves (3+1), one piece Ø 310 mm (12 1/4") bell, bore 15,0 / 16,8mm ( 630/670"), brass body, new silent valve system, stainless steel piston valves, brass body, silver plated, incl. mouthpiece, without case, weight 4,5 kg