Cov khoom no siv cov txheej txheem ntau txheej, nrog rau kev ua haujlwm siab muaj zog. Cov khoom ntawm txheej nruab nrab yog aluminium ntawv ci, uas yog noo noo-pov thawj, lub teeb-pov thawj, nrog dej zoo rwb thaiv tsev, oxygen rwb thaiv tsev muaj nuj nqi. Lwm yam khoom nyob rau hauv nruab nrab ntawm lub hnab yog nylon. Nws muaj lub zog tensile siab, tab sis kuj muaj cov cua kub zoo, tiv thaiv txias, roj tsis kam thiab organic hnyav tsis kam, hnav tsis kam, zoo heev puncture kuj.