Allora 500 Series instruments, like this AEP-550 Paris Series compensating euphonium, provide professional quality and features at an affordable price. They are perfect for advancing students, adult enthusiasts and professional musicians. The AEP-550 Paris Series compensating euphonium is fully compensating and features four valves in a 3+1 configuration. It has an 11.8" bell and a large-shank mouthpiece receiver. It comes ready to play with a mouthpiece and hardshell case, and the three-year limited warranty means Allora stands behind every instrument.