Xim iav pob, tau kawg, yog tsim los ntawm cov xim iav daws teeb meem, txhua yam kev ua yuam kev hauv cov kua yaj tsis txias lub sijhawm ua, xws li hauv cov iav kua hauv cov khoom kub kub resistant xim, los yog kev sib xyaw ntawm ob peb hom xim iav kua, los yog nyob rau saum npoo ntawm iav kua nrog cov yeeb yuj decorations. Tom qab no, cov iav kua yog maj mam txiav rau hauv tib qhov loj, thiab tom qab ntawd maj mam sib tsoo, txhuam puag ncig, thiab tom qab ntawd cov iav hlaws yog xim iav hlaws.