Giardinelli vs Kelly Trombone Mouthpieces
Giardinelli offers 16 trombone mouthpieces (made in United States), while Kelly has 17 models (made in United States). On average, Giardinelli cups measure 25.87mm versus 25.86mm for Kelly. Below we compare both lineups side by side to help you choose the right brand for your playing style.
Giardinelli
Models16
Avg cup25.87mm
Avg throat6.53mm
Common style—
CountryUnited States
vs
Kelly
Models17
Avg cup25.86mm
Avg throat—
Common styleBass
CountryUnited States
Giardinelli vs Kelly — head-to-head comparisons
- Giardinelli Sym. T vs Kelly 6-1/2AL-LS-SS
- Giardinelli Sym. T vs Kelly 12C
- Giardinelli Sym. T vs Kelly BEAST-LS-SS
- Giardinelli Sym. T vs Kelly SYMPHONY-LS-SS
- Giardinelli 1GM vs Kelly 6-1/2AL-LS-SS
- Giardinelli 1GM vs Kelly 12C
- Giardinelli 1GM vs Kelly BEAST-LS-SS
- Giardinelli 1GM vs Kelly SYMPHONY-LS-SS
- Giardinelli 4M vs Kelly 6-1/2AL-LS-SS
- Giardinelli 4M vs Kelly 12C
- Giardinelli 4M vs Kelly BEAST-LS-SS
- Giardinelli 4M vs Kelly SYMPHONY-LS-SS
All models
Giardinelli (16)
Sym. T
25.80mm · Deep
1GM
27.00mm · Deep
4M
25.40mm · Medium
2G
26.50mm · V.Deep
4D
25.40mm · Deep
1G
27.00mm · V.Deep
3D
26.30mm · Deep
3GM
26.00mm · Deep
2GM
26.50mm · Deep
3G
26.00mm · V.Deep
3M
26.30mm · Medium
5M
25.00mm · Medium
6D
24.50mm · Deep
6M
24.50mm · Medium
Sym. B.
26.70mm · V.Deep
5D
25.00mm · Deep
Kelly (17)
6-1/2AL-LS-SS
25.15mm · V.Deep · General
12C
24.13mm · Shallow · Lead
BEAST-LS-SS
28.70mm · — · Bass
SYMPHONY-LS-SS
25.65mm · — · Orchestral
51D
25.40mm · — · Professional
BASS-BONE-LS-SS
27.69mm · — · Bass
JAZZ-LS-SS
25.65mm · — · Jazz
SKY-SS
24.64mm · Shallow · Lead
51D-LS-SS
25.40mm · — · Professional
51D-SS
25.40mm · — · Professional
5G-LS
25.40mm · — · Orchestral
6-1/2AL
25.15mm · V.Deep · General
6-1/2AL-SS
25.15mm · V.Deep · General
BASS-BONE
27.69mm · — · Bass
BASS-BONE-LS
27.69mm · — · Bass
51D-LS
25.40mm · — · Professional
5G
25.40mm · — · Orchestral
Frequently asked questions
Which brand makes better trombone mouthpieces — Giardinelli or Kelly?
Neither brand is universally better. Giardinelli has 16 models and Kelly has 17. The best choice depends on your playing style, preferred cup depth, and tonal goals. Compare specific models head-to-head to find the right fit.
How do Giardinelli and Kelly trombone mouthpieces compare in size?
Giardinelli averages 25.87mm cup diameter with 6.53mm throat. Kelly averages 25.86mm cup diameter with N/Amm throat.