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Jirgin kumfa, wanda kuma aka sani da allon kumfa, abu ne mai nauyi, mai ƙarfi tare da rufin zafi, sautin sauti da abubuwan ɗaukar girgiza. Yawancin lokaci ana yin shi da polystyrene (EPS), polyurethane (PU), polypropylene (PP) da sauran kayan aiki, kuma yana da halayen ƙarancin ƙima, lalata ...Kara karantawa»