Bruno Tilz 305-D 5 vs Bruno Tilz 306-3 A
The Bruno Tilz 306-3 A has a wider cup diameter, the Bruno Tilz 306-3 A features a deeper cup, the Bruno Tilz 306-3 A has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bruno Tilz 305-D 5
• Trombone
CatalogCup diameter26.00 mm / 1.0236 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 306-3 A
• Trombone
CatalogCup diameter27.50 mm / 1.0827 in
Best suited for
Orchestral playing — large cup for full, dark tone
High-volume projection — open throat for power
Cup Diameter
The Bruno Tilz 306-3 A has a cup diameter of 27.50 mm / 1.0827 in compared to 26.00 mm / 1.0236 in on the Bruno Tilz 305-D 5 — a difference of 1.50 mm / 0.0591 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.