Abubuwan da ke cikin kebul na waje sheath an raba su zuwa sansani biyu: polyethylene (PE) da polyvinyl chloride (PVC).
Polyethylene (PE): Yana da fasali mai ƙarfi, juriya, juriya, da babban juriya. Har ila yau, yana da kyawawan kaddarorin lantarki da kayan sarrafawa. Don haka, lokacin da igiyoyi suka fallasa zuwa iska, kamar a cikin ramuka ko gadoji inda ake buƙatar jinkirin harshen wuta, muna ba da shawarar yin amfani da igiyoyi masu sheƙar polyvinyl chloride.
Polyvinyl chloride (PVC): Kwafin da kansa yana da kaddarorin kashe kansa, kyakkyawan sakamako na hana wuta, ƙarancin farashi da sassauci mai kyau. Sabili da haka, lokacin da aka shimfiɗa igiyoyi a cikin magudanar ruwa, an binne su a ƙarƙashin ƙasa kai tsaye, cike da yashi a cikin ramuka na USB, ko kuma lokacin da ruwan ƙasa ya yi girma kuma suna ci gaba da nutsewa, muna ba da shawarar zabar igiyoyi masu rufi na polyethylene!
