Inner Diameter: .670 measured .04 inches into the cup.
Outer Diameter: 1.124
Cup Depth: This mouthpiece has an MV (Medium V) cup, which is similar to a Bach 3C cup shape and depth. It is medium in depth with a slight V shape leading into the throat. It is an excellent all round mouthpiece with a very versatile sound. It is suitable for concert band, marching band, and jazz or big band. It functions well as a Piccolo trumpet mouthpiece with a medium cup is desired.
Backbore: This top is best used on an M (Medium) backbore which can be purchased here.