Kelly vs Yamaha Trombone Mouthpieces
Kelly offers 17 trombone mouthpieces (made in United States), while Yamaha has 37 models (made in Japan). On average, Kelly cups measure 25.86mm versus 25.69mm for Yamaha. Below we compare both lineups side by side to help you choose the right brand for your playing style.
Kelly
Models17
Avg cup25.86mm
Avg throat—
Common styleBass
CountryUnited States
vs
Yamaha
Models37
Avg cup25.69mm
Avg throat6.75mm
Common style—
CountryJapan
Kelly vs Yamaha — head-to-head comparisons
- Kelly BEAST-LS-SS vs Yamaha SL-48L
- Kelly BEAST-LS-SS vs Yamaha SL-48DL
- Kelly BEAST-LS-SS vs Yamaha SL-48S-GP
- Kelly BEAST-LS-SS vs Yamaha SL-53L
- Kelly 12C vs Yamaha SL-48L
- Kelly 12C vs Yamaha SL-48DL
- Kelly 12C vs Yamaha SL-48S-GP
- Kelly 12C vs Yamaha SL-53L
- Kelly 6-1/2AL-LS-SS vs Yamaha SL-48L
- Kelly 6-1/2AL-LS-SS vs Yamaha SL-48DL
- Kelly 6-1/2AL-LS-SS vs Yamaha SL-48S-GP
- Kelly 6-1/2AL-LS-SS vs Yamaha SL-53L
All models
Kelly (17)
BEAST-LS-SS
28.70mm · — · Bass
12C
24.13mm · Shallow · Lead
6-1/2AL-LS-SS
25.15mm · V.Deep · General
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
5G-LS
25.40mm · — · Orchestral
SYMPHONY-LS-SS
25.65mm · — · Orchestral
51D
25.40mm · — · Professional
51D-LS
25.40mm · — · Professional
51D-SS
25.40mm · — · Professional
5G
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
Yamaha (37)
SL-48L
25.25mm · Medium
SL-48DL
25.25mm · Deep
SL-48S-GP
25.25mm · Medium
SL-53L
25.91mm · Medium
SL-48DS
25.25mm · Deep
SL-48L-GP
25.25mm · Medium
SL-YEO-S
28.72mm · Deep
SL-51BL
25.23mm · Shallow
SL-51BS
25.23mm · Shallow
SL-52L
25.65mm · Medium
SL-YEO-GP
28.72mm · Deep
BL-60BL
27.83mm · Shallow
BL-60L
28.25mm · Medium
SL-46BS
24.58mm · Shallow
SL-46C2S
24.59mm · Medium
SL-48S
25.25mm · Medium
BL-58L
26.84mm · Medium
SL-45C2S
24.26mm · Medium
SL-45C2S-GP
24.26mm · Medium
SL-47S
24.98mm · Medium
Frequently asked questions
Which brand makes better trombone mouthpieces — Kelly or Yamaha?
Neither brand is universally better. Kelly has 17 models and Yamaha has 37. 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 Kelly and Yamaha trombone mouthpieces compare in size?
Kelly averages 25.86mm cup diameter with N/Amm throat. Yamaha averages 25.69mm cup diameter with 6.75mm throat.