Kelly 6V vs Kelly 6V-UK
Both mouthpieces share similar core dimensions — the differences are in the details.
Mouthpiece A
Kelly 6V
• Cornet
Dark/DeepCup diameter16.00 mm / 0.6299 in
Cup depth
Rim width—
Throat diameter4.06 mm / 0.1598 in
BackboreL
Finish—
MaterialLexan polycarbonate
Best suited for
High-volume projection — open throat for power
Deep V-cup to fill out cornet sound
vs
Mouthpiece B
Kelly 6V-UK
• Cornet
Dark/DeepCup diameter16.00 mm / 0.6299 in
Cup depth
Rim width—
Throat diameter4.06 mm / 0.1598 in
BackboreL
Finish—
MaterialLexan polycarbonate
Best suited for
High-volume projection — open throat for power
Deep V-cup cornet sound
Cup Diameter
Both mouthpieces have virtually identical cup diameters at 16.00 mm / 0.6299 in.
Cup Depth
Both mouthpieces share a — cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 4.06 mm / 0.1598 in, so resistance feel will be comparable.
Material
Both mouthpieces share the same listed material (Lexan polycarbonate).
Which is better?
Both mouthpieces are categorized as "Dark/Deep" — the physical dimensions above will determine which suits your embouchure and playing style better.