Flex mouthpieces are made using Stomvi's proprietary Bellflex brass alloy. This alloy has extremely resonant properties and is integral to the design of Flex mouthpieces.

The VR series use a new cup and backbore balance, designed by K.O. Skinsnes. VR cups are a hybrid design, functioning like a shallow cup in being easier to play and increasing endurance, yet with their unique shape and internal volume producing the bigger sound and timbre of a deeper cup, with a rich spectrum of harmonics in the sound.

Flex mouthpieces offer different backbore choices and are available as solid shank or cut for sleeves, which allows you to adjust the gap from the end of the mouthpiece to the start of the leadpipe. The sleeves themselves must be ordered separately; please contact us at Thompson Music.

VR mouthpieces are available with Bach-equivalent 1, 1½, 3, 5, 7, 12, and select additional rim widths, each in the full range of cup depths. Furthermore, each rim/cup combination is available with one of the following backbores:

• Vs: a very efficient backbore, great for lead players, but also works well on deep-cup classical mouthpieces
• #0: a well in-tune, all-around backbore
• #5: an orchestral backbore, designed to function like a traditional "Schmidt" backbore

All Flex Mouthpieces are made using a combination of CNC machining and hand balancing. Choosing the correct mouthpiece is a very personal endeavor; feel free to contact us with any questions or concerns and we'll do our best to help you in your quest.

Models are listed on this page by cup size, from smallest to widest.