1. Lub npog aluminium tsis kaw nruj nreem, ua rau muaj kev sib tsoo thiab kev sib tsoo thaum lub sijhawm thauj mus los thiab khaws cia, uas cuam tshuam rau kev sib khi ntawm cov khoom.
2. Cov txheej txheem tsim kua muag yog siv zog heev, lossis yog tias nws tawg ib nrab, nws txhais tau tias tag nrho cov npog tsis tuaj yeem raug torn, ua rau tsis yooj yim rau kev siv.
3. Lub zog qhib tsim nyog yog qhov zoo rau kev ua haujlwm ntawm cov neeg ua haujlwm kho mob.