Gold plated. 25.50mm cup diameter with a 0.279" throat bore. The Griego 5GM has a 5 rim with a cup that is in between a 5 and a 6.5. Perfect for the high player that needs a little more embouchure room but wants the shallower cup. Traditional "New York"style exterior is similar in appearance to Bach models, but slightly heavier, with the weight distributed evenly around the bottom of the cup.