Girazi Rekunwa Dhizaini yemutsara wemigirazi ye Tube yakafuridzirwa negirazi re borosilicate, rinozivikanwa nehunhu hwaro hwezvinhu. Muunganidzwa uyu une chimiro chemadziro maviri, unoita sekunge chine chubhu chekuyedza chinoyangarara mukati merutsigiro rwekunze runoonekera. Girazi rakati chechetere pasi rinouya muhukuru hutatu hunogona kurongwa pamusoro pemumwe, rinofanira zvinwiwa zvinopisa kana zvinotonhora. Chinhu ichi chinobvumira maumbirwo akasiyana nemavara, uye magirazi aya ane maumbirwo akanaka ekubata uye anogona kusukwa mumushini wekusuka midziyo. Paketi yaro yakagadzirwa nekadhibhodi rakashandiswa kare, ichisimbisa kukosha kwekuchengetedza zvakatipoteredza.