Ozbone Trombone Mouthpieces are trombone mouthpieces in the two standard sizes a school program actually uses, 11C in blue and 6.5AL in clear.

The two sizes that cover almost every student trombone part, in colours you can tell apart across a band room.

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Mouthpieces disappear. They get swapped, dropped and left on stands, and a director who cannot tell an 11C from a 6.5AL at a glance loses time every rehearsal sorting it out. Colouring them solves that.

An 11C is the standard small shank student size, shallower and easier to produce a sound on. A 6.5AL is the standard large shank size, deeper, with a broader sound and more low register support. Most players start on an 11C and move to a 6.5AL when they move to a large bore horn.

Which Size Should a Student Use?

An 11C on a small bore student trombone, which is what most beginners play. Move to a 6.5AL at the same time as moving to a large bore horn, usually around high school. Changing mouthpiece and instrument together is easier than changing one at a time.

What Is the Difference Between a Small and Large Shank?

The shank is the tapered end that goes into the receiver. Small shank and large shank are different diameters and are not interchangeable. A small shank mouthpiece in a large shank receiver will not seat and will wreck the intonation.

Why Are They Coloured?

So a director can identify a size across a room and so students stop taking each other’s. It is a practical feature for a band program rather than a cosmetic one.