Cov qhov rooj hluav taws tau muab faib ua cov qhov rooj hluav taws kub, steel qhov rooj hluav taws, steel thiab ntoo hluav taws qhov rooj, lwm qhov hluav taws kub qhov rooj, thiab lwm yam. Cov qhov rooj hluav taws yog siv tshwj xeeb los cais cov hluav taws kub hauv cov tsev, uas ua lub luag haujlwm loj hauv kev tua hluav taws. Thaum hluav taws tshwm sim, tib neeg tuaj yeem tau txais txoj hauv kev khiav los ntawm qhov rooj hluav taws.

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