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 12C
- Giardinelli Sym. T vs Kelly 6-1/2AL-LS-SS
- Giardinelli Sym. T vs Kelly BASS-BONE-LS-SS
- Giardinelli Sym. T vs Kelly SKY-SS
- Giardinelli 1GM vs Kelly 12C
- Giardinelli 1GM vs Kelly 6-1/2AL-LS-SS
- Giardinelli 1GM vs Kelly BASS-BONE-LS-SS
- Giardinelli 1GM vs Kelly SKY-SS
- Giardinelli 4M vs Kelly 12C
- Giardinelli 4M vs Kelly 6-1/2AL-LS-SS
- Giardinelli 4M vs Kelly BASS-BONE-LS-SS
- Giardinelli 4M vs Kelly SKY-SS
All models
Giardinelli (16)
Sym. T
25.80mm · Deep
1GM
27.00mm · Deep
4M
25.40mm · Medium
1G
27.00mm · V.Deep
2G
26.50mm · V.Deep
4D
25.40mm · Deep
5M
25.00mm · Medium
2GM
26.50mm · Deep
3D
26.30mm · Deep
3G
26.00mm · V.Deep
3GM
26.00mm · Deep
3M
26.30mm · Medium
6D
24.50mm · Deep
Sym. B.
26.70mm · V.Deep
5D
25.00mm · Deep
6M
24.50mm · Medium
Kelly (17)
12C
24.13mm · Shallow · Lead
6-1/2AL-LS-SS
25.15mm · V.Deep · General
BASS-BONE-LS-SS
27.69mm · — · Bass
SKY-SS
24.64mm · Shallow · Lead
BEAST-LS-SS
28.70mm · — · Bass
JAZZ-LS-SS
25.65mm · — · Jazz
SYMPHONY-LS-SS
25.65mm · — · Orchestral
51D
25.40mm · — · Professional
51D-LS-SS
25.40mm · — · Professional
51D-SS
25.40mm · — · Professional
5G
25.40mm · — · Orchestral
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
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.