Riot ntaub thaiv, Polycarbonate khoom siv.
Yog hais txog cov cuab yeej tiv thaiv zoo ib yam li cov ntaub thaiv ntawm cov ntaub thaiv uas siv los ntawm tub ceev xwm tub rog, Riot tub ceev xwm lossis tub rog tub rog. Nws yog siv los thawb cov neeg sib tw thiab tiv thaiv lawv tus kheej hauv cov txheej txheem ntawm kev kub ntxhov. Nws tuaj yeem tiv thaiv cov khoom nyuaj, tsw qab khoom thiab tsis paub kua. Qhov kev tawm tsam kuj tseem tuaj yeem tiv thaiv cov mos txwv qis-ceev, tab sis tsis tuaj yeem tiv thaiv tawg thiab muaj cov mos txwv siab.
