Simon Willats
| Model | Bell | Slide | Gooseneck / Valve | Tuning Slide | Leadpipe |
|
R1
|
Yellow brass
|
Nickel silver
|
Gooseneck
|
Red brass
|
1
|
|
R4F
|
Red brass
|
Yellow brass
|
Rotax
|
Yellow brass
|
5
|
|
R9
|
Red brass
|
Yellow brass
|
Rotax
|
Yellow brass
|
9
|