Lub vaj huam sib luag nyuj yog ib hom welded steel tubular nyuj laj kab rau cov tsiaj txhu kho kom zoo.Nws yog tsim los ntawm oval thiab square tubes.Raws li kev kho saum npoo, nws yog kub-dipped galvanized thiab ces PVC coated.Cov txheej txheem txheej txheej tshwj xeeb no ua rau nws zoo ntawm kev tiv thaiv xeb.