Asper Trombone Mouthpiece Visualizer - PlasticJust released! The well known and respected Asper visualizer design, now for trombone. Designed for comfort, strength, and mass. Manufactured from strong resin, these new Asper Visualizers provide a fast and affordable way to practice and strengthen your embouchure. Available in: Large Bore Tenor 5: 1. 024" 26. 01mm Bass Trombone 1. 5: 1. 127" 28. 63mm Included is a short tutorial for daily practice. See more here!