Conn vs Kelly Trumpet Mouthpieces
Conn offers 29 trumpet mouthpieces (made in United States), while Kelly has 14 models (made in United States). On average, Conn cups measure 16.38mm versus 16.56mm for Kelly. Below we compare both lineups side by side to help you choose the right brand for your playing style.
Conn
Models29
Avg cup16.38mm
Avg throat3.66mm
Common styleLead
CountryUnited States
vs
Kelly
Models14
Avg cup16.56mm
Avg throat3.91mm
Common styleGeneral
CountryUnited States
Conn vs Kelly — head-to-head comparisons
- Conn Helleberg 7B vs Kelly 5C
- Conn Helleberg 7B vs Kelly 5C-BUGLE
- Conn Helleberg 7B vs Kelly 7C-BUGLE
- Conn Helleberg 7B vs Kelly SHEW-JAZZ
- Conn Precision 4 vs Kelly 5C
- Conn Precision 4 vs Kelly 5C-BUGLE
- Conn Precision 4 vs Kelly 7C-BUGLE
- Conn Precision 4 vs Kelly SHEW-JAZZ
- Conn Connstellation 5BN vs Kelly 5C
- Conn Connstellation 5BN vs Kelly 5C-BUGLE
- Conn Connstellation 5BN vs Kelly 7C-BUGLE
- Conn Connstellation 5BN vs Kelly SHEW-JAZZ
All models
Conn (29)
Helleberg 7B
16.20mm · Medium · All-round
Precision 4
16.41mm · Medium · General
Connstellation 5BN
16.76mm · V.Deep · Orchestral
Harry Glanz 5M
· Medium · Lead
Connstellation 5BW
16.76mm · V.Deep · Orchestral
Harry Glanz 7M
· Medium · Lead
Imp. Precision 1
16.56mm · — · General
Imp. Precision 2
16.41mm · — · General
Imp. Precision 4
16.41mm · Medium · General
Imp. Precision 5
· Shallow · Lead
Precision 1
16.56mm · — · General
Precision 2
16.41mm · — · General
Precision 5
· Shallow · Lead
Connstellation 5CN
16.76mm · — · Orchestral
Connstellation 9BW
15.88mm · V.Deep · Lead
Connstellation 9CN
15.88mm · — · Lead
Connstellation 9CW
15.88mm · — · Lead
Harry Glanz 6M
· Medium · Lead
Imp. Precision 3
16.41mm · Medium · General
Imp. Precision 6
16.41mm · Shallow · Lead
Kelly (14)
5C
16.76mm · V.Deep · General
5C-BUGLE
16.76mm · V.Deep · General
7C-BUGLE
16.51mm · Medium · General
SHEW-JAZZ
16.51mm · — · Jazz
3C
17.02mm · V.Deep · General
SCREAMER
16.00mm · Shallow · Lead
SCREAMER-BUGLE
16.00mm · Shallow · Lead
V-BOMB
16.00mm · — · Lead/Extended
4B
16.51mm · — · Orchestral
7C
16.51mm · Medium · General
CKB-7C
16.51mm · Medium · General
PRO
17.27mm · — · Professional
SYMPHONIC
17.53mm · — · Orchestral
6V
16.00mm · — · Dark/Deep
Frequently asked questions
Which brand makes better trumpet mouthpieces — Conn or Kelly?
Neither brand is universally better. Conn has 29 models and Kelly has 14. 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 Conn and Kelly trumpet mouthpieces compare in size?
Conn averages 16.38mm cup diameter with 3.66mm throat. Kelly averages 16.56mm cup diameter with 3.91mm throat.