Heavy steel ib qhov hluav taws kub yog qhov ruaj khov heev. Hauv kev siv tiag tiag, lub qhov rooj steel tsis yooj yim rau kev puas tsuaj los ntawm sab nraud, thiab tuaj yeem tiv thaiv cov khoom siv sab hauv. Hnyav hluav taws qhov rooj txais cov khoom siv kho vajtse zoo, uas yog hnav-tiv taus thiab muaj lub neej ua haujlwm ntev.

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