Tef ɗin bututu, kuma ake kiraduck tef, shine tef- ko srim-goyon bayan matsa lamba-m tef, sau da yawa mai rufi da polyethylene.Akwai gine-gine iri-iri ta amfani da mabambantan baya da adhesives, kuma ana amfani da kalmar 'kaset tef' sau da yawa don nufin kowane nau'in kaset ɗin zane daban-daban na dalilai daban-daban.