LEGACY: Vincent Bach was a rare combination of artist and engineer. He was constantly changing his mouthpiece designs until the mid 1960’s when they became more standardized. The formalization of the 27 throat and backbore to cup letter (A=24, B=7, C= 10, etc.) created a standard for the mouthpiece making that is still used today. These standards are known today as the Classic Series. FIT: Because no two players have the same lip or tooth formation, what is perfect for one player may be entirely unsuitable for another. Bach produces thousands of different combinations of rims, cups and backbores so that each player can find the best mouthpiece for their individual embouchure. A mouthpiece consists of the rim, cup, throat, and backbore. Bringing these various components into proper relationship constitutes the art of superior mouthpiece production. CUP DEPTH: The shallow cup of the Bach Classic Trumpet Silver Plated Mouthpiece Size 3E (Model 3513E) is designed for brasses in high keys and aids in high register production. DESCRIPTION: Preferred by players who want a large mouthpiece but with a shallow cup. Facilitates high register. DIMENSIONS: Cup: Shallow | Approx. Cup Diameter: 16.30mm | Rim Shape: Medium wide