Ruwan kasa allura kwalba kofa ne kara kofa, za a iya da aluminum rufi, aluminum filastik hade rufi, butyl plug, silicon plug da dai sauransu. Wannan allura kwalba yana da launin ruwan kasa, m da sauran nau'ikan, da kwalba wuyan ƙananan, da kwalba wuyan ƙananan daidai. Kofin kwalba yana da ɗan ƙarfi fiye da wuyar kwalba, kuma yana da ƙarfi fiye da jikin kwalba. Yawancin amfani a matsayin kwalban allura na magunguna, kwalban ruwa na baki, da dai sauransu. Kayan ne sodium calcium gilashi, shi ne da 1550 ~ 1600 ℃ high zafi narkewa, ƙirƙirar, da kuma da sauri sanyaya da aka yi da non-deformable non-crystalline karfi kayan, kuma yana da zafi juriya, matsin lamba juriya, tsaftacewa amfani, duka high zafi sterilization, ko kuma low zafi ajiya, shi ne saboda shi da yawa amfani, don ba da mafi dacewa don sanya wasu magunguna foda, wannan allura kwalba yin hanyar da aka gyara.