Feem ntau steel hluav taws qhov rooj raug kho los ntawm kev pleev xim rau saum npoo; steel hluav taws qhov rooj tuaj yeem muab cov qhov rais, kaw, qhov cua tshuab kaw, thiab lwm yam raws li qhov xav tau. Steel qhov rooj hluav taws kuj muaj kev nyab xeeb heev, thiab yuav tsis cuam tshuam rau lwm tus neeg txoj haujlwm txhua hnub vim qhib thiab kaw qhov rooj, uas tuaj yeem zam qee qhov xwm txheej.