Standard Series Trumpet Mouthpiece Group I Specifications:

• • 5A4: 15.84 mm, .624" cup diameter; 26 throat. Small cup diameter which aids upper register. Popular for use as a piccolo trumpet mouthpiece.

• • 6A4a: 15.99 mm, .630" cup diameter; 27 throat. Shallow A cup with cushion number 4 rim for extreme high register work.
• • 7B4: 16.08 mm, .633" cup diameter; 26 throat. Excellent for the player with thin lips. Number 4 rim provides good endurance with a brilliant tone.
• • 8 mmA4: 16.25 mm, .640" cup diameter; 26 throat. The slightly funnel-shape cup at the entrance to the throat provides a good tone and the number 4 semi-flat rim gives superior endurance.
• • 8 mmE2: 16.15 mm, .636" cup diameter; 26 throat. The deep funnel-shaped cup provides a smooth tone and is very flexible in all registers. Recommended for cornet players
• • 9: 16.33 mm, .643" cup diameter; 26 throat. Standard characteristics allow for a full penetrating tone quality.
• • 9C4: 16.36 mm, .644 in cup diameter; 26 throat. Like the 9 mouthpiece, however the 4 semi-flat rim provides excellent endurance.
• • 10A4a: 16.43 mm, .647" cup diameter; 27 throat. The combination of the shallow A cup, semi-flat number 4 rim and tight a-backbore assists with upper register work.
• • 10A4: 16.43 mm, .647" cup diameter; 27 throat. Same as the 10A4a but with a standard c-backbore, which offers less resistance.
• • 10B4: 16.43 mm, .643" cup diameter; 26 throat. A medium-small funnel-shaped B cup offers both a quality sound and support in the register.
• • 11A: 16.51 mm, .650" cup diameter; 26 throat. This rim size and contour is similar to the model 11 mouthpiece, but with a shallower A cup.
• • 11AX: 16.51 mm, .650" cup diameter; 27 throat. This model was developed for the Schilke piccolo trumpets. The x-backbore improves the ease of playing and opens up the sound on a piccolo trumpet. 
• • 11C2: 16.51 mm, .650" cup diameter; 26 throat. Similar to the model 11 featuring a slightly rounded number 2 rim contour.
• • 11: 16.53 mm, .653" cup diameter; 26 throat. A superior mouthpiece with standard characteristics for a free-blowing mouthpiece.
• • 11D4: 16.58 mm, .653" cup diameter; 26 throat. Slightly deeper than the model 11 with a number 4 semi-flat rim, which provides a definite cushion feel for endurance.
• • 11E: 16.58 mm, .653" cup diameter; 26 throat. The large funnel-shaped cup encourages a big round tone, ideal for cornet.
• • 12A4a: 16.71 mm, .658" cup diameter; 27 throat. Similar to the 12B4, but with a shallow A cup and tight a-backbore, which adds both endurance and range.
• • 12A4: 16.71 mm, .658" cup diameter; 27 throat. This mouthpiece is the same as a 12A4a, but with a standard c-backbore.
• • 12B4: 16.71 mm, .658" cup diameter; 26 throat. This medium-small conical B cup provides a full tone and the number 4 semi-flat rim allows for more endurance.
• • 12: 16.69 mm, .657" cup diameter; 26 throat. A traditional medium size mouthpiece that includes a number 3 standard rim and c-backbore, which allows the player a full spectrum of sound.
• • 13A4a: 16.76 mm, .660" cup diameter; 27 throat. The shallow A cup, semi-flat number 4 rim and tight a-backbore creates an ideal lead mouthpiece.
• • 13A4: 16.76 mm, .660" cup diameter; 27 throat. Same as the 13A4a, but with a standard c-backbore which allows a free-blowing feel.
• • 13B: 16.77 mm, .660" cup diameter; 26 throat. This mouthpiece has a B cup that is slightly deeper than the 13A4 and also offers a narrower round rim.
• • 13: 16.8 mm9mm, .665" cup diameter; 26 throat. Ideal choice for a student or developing player with standard number 3 rim contour. The rounder rim provides increased flexibility and quick response. The C cup offers volume for tone.