3 GVR Flex Trumpet Mouthpiece

Rated 5.00 out of 5 based on 2 customer ratings
(2 customer reviews)

From: $225.00


Click picture for Flex Mouthpiece Concepts

Mt. Vernon Bach 3 Rim – Inner Diameter = .655″ (16.64 mm)
Our 3 GVR Flex trumpet mouthpiece is a great choice for a player who plays a Bach 3C and wants more “zing” in the upper register.

Players coming from a Bach 3C or equivalent report our Flex 3 GVR is 10-30% easier to play with better intonation and a more resonant sound.
This is due to our advanced acoustic design and Flex Alloy.

How to Choose/Order

1. Choose an Acoustic Series Click here for Series Advice
2. Choose Silver or Gold Plating
3. Choose three Flex Couplers (included with mouthpiece price)
Click here for how to choose Flex Couplers (Advice and Details)

A Flex Coupler is needed to use this mouthpiece (3 are included in price).
Contact Us with any questions you may have.
(Acoustic Series are listed in order of popularity for this mouthpiece)


Series Information

Weight 0.3 lbs
Dimensions 3 x 1 x 1 in
Series Design (Mouthpiece balance)

By developing mouthpieces as complete systems, or series, we have been able to combine the best internal shapes and sizes to maximize the performance of each mouthpiece. In this manner you are assured of a mouthpiece that has been balanced acoustically for maximum sound and ease of play.




Silver plated, Gold Plated

Flex Alloy

A proprietary brass alloy and treatment. It is extremely resonant and transfers energy very efficiently thus adding to ease of play.

3 GVR Vs Series

Speed of Sound Series which is good for Lead Trumpet, Amplified Music, and Pit Work.

3 GVR J6 Series

J6 Series which is good for Lead Trumpet, Amplified Music, and Pit Work. It has more "core" to the sound than the Vs. Some say it requires a little bit more air than our Vs Series.

3 GVR 5 Series

Great all around Series. Very good for Jazz Trumpet, Brass Quintet, wedding, and Orchestral including C Trumpet.

3 GVR M4G Series

Our M4G Series is the latest development in small volume cup acoustic design. It provides a huge resonant sound with an extremely easy upper register.

2 reviews for 3 GVR Flex Trumpet Mouthpiece

  1. Rated 5 out of 5


    When I switched to a 3GVR it instantly solved several playing problems I was having. Articulations got much better and my tone got better too! Plus it is a comfortable rim – for me it is the perfect balance between comfort and control. However the best part is having the resource of the Stomvi staff – they will work with you to find a mouthpiece that works for you.

  2. Rated 5 out of 5


    The Flex 3 GVR J6 series was everything K.O (and the website) described – and I’m thoroughly impressed with the craftsmanship, packaging, service, not to mention the product: the 3 rim turned out to be a great fit for me, and the evenness of sound, ease of playability are excellent!! I’m also a fan of the couplers – when I dialled in the right one (for me it’s the 4.5) everything aligned – intonation, range, continuity of sound and articulations!

    Yes, it’s still a trumpet, and no mouthpiece is the magic solution or replacement of hard work…BUT…as the website states – it is easier! 🙂

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