Wayne: Wayne: "This model is identical to the original Studio model. The only difference is in the back bore. The #1 back bore provides a bit more resistance and adds some extra focus and zip to the sound.

Specs:
Backbore: 1
Cup Volume: 0.0666 Cubic Inches (Small)
Cup Diameter: .631 Inch
Contour: Semi Flat-Wide
Bite: Soft
Alpha Angle: High