Unlike the sousaphone and French horn, the trumpet has a long, narrow, ovular shape. A piccolo trumpet is half the length of a trumpet and often has four valves. Its pitch is one octave higher than a trumpet.
A pocket trumpet makes the instrument’s coils of tubes more compact and dense, allowing a smaller and more portable instrument to sound basically the same, convenient for young and traveling musicians.
The flugelhorn is similar to a trumpet, but has a larger cone at the bell, causing a more mellow sound. The cornet is smaller, thus sounding higher on the sonic spectrum.