Tech Specs Instrument:Trumpet Size:14A4a Cup Diameter:0.673" (17.09mm) Cup Depth:Shallow Cup Shape:A-shape Rim:Semi-flat Throat:27 Backbore:Tight "A" The Schilke 14A4a is ideal for trumpet players who need a bright, brilliant sound with excellent projection, especially in the upper register. Its shallow A-shape cup and tight "A" backbore make it a popular choice for lead trumpet players in jazz, commercial, or big band settings, as it helps achieve those high notes with clarity and ease.