This overblowing behavior explains the clarinet's great range and sophisticated fingering system. The fifth and 7th harmonics are also accessible, sounding an additional
sixth and fourth a flat, reduced fifth higher respectively; these are the notes of the altissimo register. This may be why the internal "waist" dimension is so crucial to those harmonic frequencies. Clarinet bodies were crafted
from just a few components adding wood, plastic, hard rubber, metal, resin, and ivory. The vast majority of clarinets utilized by specialists are made from African hardwood, mpingo African Blackwood or grenadilla, rarely because of diminishing provides Honduran rosewood and infrequently even cocobolo. Historically other woods, basically boxwood, were used.