Trombone Mouthpiece Hammond Design Hammond 14S Cup Inner Diameter: 24.7mm Model: 14S Equivalent to Bach 7 S... Shallow cup. For lead trombone and alto trombone. Characterized by a bright tone. Custom mouthpiece designed and manufactured by Carl Hammond, who has a background as a custom mouthpiece craftsman at the Silky company. I purchased this for use with an alto trombone. It was very easy to play, but the tone was different from what I expected, so I am selling it.