Ƙofar gobarar Ƙofa ita ce firam ɗin kofa, kwarangwal ɗin ganyen kofa da bangon ganyen kofa da aka yi da kayan ƙarfe. Idan ganyen kofa ya cika da kayan, an cika shi da kayan hana wuta da abubuwan da ba su da lahani ga jikin ɗan adam. Ƙofofin wuta na ƙarfe na iya tabbatar da cewa ba a sauƙaƙe su lalacewa ta hanyar lalacewa ta hanyar tasiri da ƙarfin waje, kuma ana iya amfani da su kullum na dogon lokaci ba tare da maye gurbinsu ba.

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