Romera Brass Euphonium/Trombone Mouthpiece Anthony Caillet Signature Model AC66 Rim Inner Diameter: 26mm Throat Diameter: 7mm Depth: 32mm Silver Plated, for Large Shank Signature series from the Spanish brand "Romera Brass", the Anthony Caillet model, an international euphonium player. The AC66 is a model based on the Denis Wick 4AL. There are some shank marks, but it is generally in good condition.