Rim Size "4" Mouthpieces 

Cup Diameter: 26.1mm, 1.032” Rim Width: Medium Wide Bore: 'K', .281"

Model: 4GS Cup Depth: Medium

Model: 4GSD Cup Depth: Slightly Deeper 4GS

Model: 4G-5G Cup Depth: Medium Deep

Model: 4G-5GD Cup Depth: Slightly Deeper 4G-5G

Model: 4G Cup Depth: Deep

Please Note:
Alternate Bore/Backbore Available: .277”/#1
Symphony Tenor Trombone mouthpieces are available in four weights: Light, Regular, Medium, and Heavy.

Alternative shanks are also available and can be selected with the ‘Shank Option’ drop down box.
‘Medium Tenor’ (small shank), ie Bach 36, 
‘Medium Shank’, ie Willson Euphonium (European Taper) 
’Conn’, ie 88H.

If a different shank is selected, the bore size and backbore will be adjusted accordingly for the right balance.