Urupapuro rwubaka Dongan icyuma cyometseho imitako ya sandwich, ni ubwoko bwibikoresho bishya byo kubaka inyubako zo hanze no gushushanya, bikundwa nabubatsi benshi kandi benshi. Imbere ifite ibikoresho bitandukanye bifite ubucucike buri hejuru, nka pu, eps, pir nibindi. Ubuso ni AL-ZN ibinyobwa bisize impapuro. Kandi kubwokwirinda, kutirinda umuriro no kutangiza, ibikoresho byo hasi bifata aluminium foil layer, ifite imikorere myiza yo gukumira no kwangiza.
