Bob Reeves patented his sleeve system in 1974 (US
Patent 3,808,935). This system allows the trumpet
player to optimize his/her gap for sound, pitch, and
playability or to use the same mouthpiece in
different horns that require a different gap.
Once a mouthpiece has been converted for our sleeve
system, different sleeves can be used in order to
"dial in" the correct gap. Our sleeves
vary in diameter in small, but significant,
increments thus increasing or decreasing the gap.
They are available in
quarter sizes from #1 through #7 (largest gap is #1,
smallest is #7).
The change in gap from one sleeve size to the next
is .0625" (1/16 inch). Sleeves are available in half
sizes allowing for gap adjustments of .0313 (1/32
inch) and quarter sizes allowing gap adjustments of
.0151 (1/64 inch).