Cov khoom no yog ib qho tshwj xeeb mesh npog rau cov neeg hais lus, tag nrho xav txog qhov tsim acoustic, thiab yuav tsis muaj kev cuam tshuam ntawm lub suab nrov lossis qis.Cov ntaub no yog tuab thiab tawv, tsis muaj elasticity.