These British cornet mouthpieces have a deep cup depth, similar to the Wick cornet cup.
64D BRC
Inner Diameter: .640 measured .04 inches into the cup.
ID similar to a Wick 5, with a wider, more comfortable rim
65D BRC
Inner Diameter: .650 measured .04 inches into the cup.
ID between Wick 4 and 5, with a wider, more comfortable rim.
66D BRC
Inner Diameter: .660 measured .04 inches into the cup.
ID similar to the Wick 4, with a wider, more comfortable rim.
67D BRC
Inner Diameter: .67 measured .04 inches into the cup.
ID similar to the Wick 2, with a wider, more comfortable rim.
68D BRC
Inner Diameter: .67 measured .04 inches into the cup.
Larger ID than the Wick 2, with a wider, more comfortable rim.