Bruno Tilz 215-10 GS vs Bruno Tilz 305-D 5
The Bruno Tilz 215-10 GS has a wider cup diameter, the Bruno Tilz 215-10 GS has a larger throat opening.
Mouthpiece A
Bruno Tilz 215-10 GS
• Trombone
CatalogCup diameter29.50 mm / 1.1614 in
Cup depth
Rim width—
Throat diameter7.20 mm / 0.2835 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Bruno Tilz 305-D 5
• Trombone
CatalogCup diameter26.00 mm / 1.0236 in
Cup depthMedium
Rim width—
Throat diameter6.30 mm / 0.2480 in
Backbore—
Finish—
Material—
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bruno Tilz 215-10 GS has a cup diameter of 29.50 mm / 1.1614 in compared to 26.00 mm / 1.0236 in on the Bruno Tilz 305-D 5 — a difference of 3.50 mm / 0.1378 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Throat Diameter
The Bruno Tilz 215-10 GS has a wider throat (7.20 mm / 0.2835 in vs 6.30 mm / 0.2480 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.
Which is better?
Both mouthpieces are categorized as "Catalog" — the physical dimensions above will determine which suits your embouchure and playing style better.