The instrument is made with special crooks. Their ventholesare adapted to the higher keys of the instrument. Therefore, these do not fit the regular 3-hole short trumpet.
It can also be played with the crooks of the regular 3-hole short trumpet, but the ventholes are not in the ideal position. In this case, the E-crook is used for F 440, and the Eb-crook for F 415.
F bow and F415 bow are combined with the regular Eb leadpipe in sig form.
The Eb crook is combined with the regular D leadpipe.