Singabathengisi abakhulu bemveliso epheleleyo kwicandelo leeprofayili ze-aluminium kumantla eTshayina. Imigca emithathu yemveliso yeprofayili ye-aluminium eqaliswe ukusebenza kwiminyaka emibini edlulileyo igqityiwe, ingakumbi imveliso yovavanyo yomgca omtsha wemveliso weetoni ezili-1000 kulo nyaka ibe yimpumelelo.