It is an embouchure visualiser. See photos for sizes.
BACH embouchure Visualizer practice for rim [1825] Tron for bones
BACH embouchure Visualizer practice for rim [1826] double for trumpet / trombon
Trompette Trombone Embouchure Dressage Tuning Musique Instrument
Flute Mouthpiece Exerciser, Metal Embouchure Trainer with Removable Rubber Ring, Embouchure Training Device, Lip Muscle Builder for Trumpet Trombone Saxophone
Embouchure Training Device,Embouchure Training Device Alloy Steel Mouth Strength Trainer for Trumpet Trombone Saxophone Clarinet Horn
![BACH embouchure Visualizer practice for rim [1825] Tron for bones](https://images.buynet.work/thumb.php?i=370600381&s=240)
![BACH embouchure Visualizer practice for rim [1826] double for trumpet / trombon](https://images.buynet.work/thumb.php?i=384489385&s=240)
![BACH embouchure Visualizer practice for rim [1825] Tron for bones](https://images.buynet.work/thumb.php?i=389839188&s=240)
