A new design with a smaller diameter than the 3. Same sweet sound as a 3 but with easier top notes
Cup diameter: 18.0mm.
Rim width: 6.07mm.
Throat: 5.2mm.
Backbore: V-Type.

All Denis Wick tenor (alto) horn mouthpieces use deep funnel cups for maximum quality of tone and flexibility with matched throats and backbores for perfect intonation.