Isikhwama se-zip esikwele esikwele ngokuvamile sinezinhlangothi ezi-5, ngaphambili nangemuva, izinhlangothi ezimbili nangaphansi. Isakhiwo esiyingqayizivele sesikhwama esisezingeni lesikwele sinquma ukuthi kulula kakhulu ukupakisha izimpahla ezinezici ezintathu noma imikhiqizo yesikwele. Lolu hlobo lwesikhwama alunakubheka kuphela okushiwo okufakwayo kwesikhwama sepulasitiki, kepha futhi kunwebisa ngokuphelele umbono omusha wokufaka, ngakho-ke manje usetshenziswa kabanzi empilweni nokukhiqizwa kwabantu.