Nau’o’in kofofin wuta an raba su zuwa kofofin wuta na itace da kofofin wuta na karfe. An raba su zuwa maki uku: Grade A, Grade B da Grade C. Maki uku sun fi tsayin lokacin juriyar wuta. Class A Ƙofar hana wuta, tare da juriyar wuta na 1.2; Ƙofar B mai hana wuta, tare da juriyar wuta na 0.9; Ƙofar kariya ta Class C, tare da juriyar wuta na 0.6.

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