Handmade in Paris, France, the AC154 Professionel Series features a .413-inch bore with a direct air column design in the valveblock for less resistance and outstanding response. The AC154 Series also features a 6.6-inch bell for superior projection and tone. It is a beautiful design in terms of its free-blowing nature and ergonomic comfort, as well as in terms of sleek, fluid lines and a superb finish. No attention to detail is spared with this elegant, spectacular instrument.