Takulandilani kumalo athu osangalatsa a zitseko zopangidwa kuchokera ku zida zapamwamba za zinc alloy.Izi zogwirira zitseko sizimangogwira ntchito komanso zimatulutsa mpweya wabwino komanso wokongola, zomwe zimawapangitsa kukhala abwino kwambiri mkati mwa mkati.