Dej qab zib-kua qaub iav yog ib hom iav siv rau ntau yam kev siv, suav nrog kev tsim khoom ntawm cov iav fwj. Cov fwj iav ua los ntawm cov dej qab zib-kua tau siv rau cov khoom ntim khoom, muaj lwm yam kua, thiab duab plaub lossis plaub hau cylindrical puab.
