● Kulayl, micnaha, gariiradda kulul-duuban, kaas oo ah sallax (badanaa loogu talagalay.
● Ku shubista billet) sida walxo ceeriin ah, kululaynta ka dib, waxa laga sameeyaa bir xariijimo ah iyadoo loo samaynayo unug duuban oo dhammaystiran.
● Xarigga kulul ee ka soo baxa mashiinka duubista ee ugu dambeeya ee duubista dhamaystirka ayaa lagu qaboojiyaa qulqulka laminarka ilaa barta loo dhigay.
● Gariiradda waxaa lagu rogaa gariiradda xariijimaha birta ah iyadoo la raacayo gariiradda birta, iyo gariiradda birta ee la qaboojiyey ayaa loo isticmaali karaa iyadoo loo eegayo baahiyaha kala duwan ee isticmaalayaasha.
● Kadib khadadka dhamaystirka ee kala duwan (heeraynta, toosinta, gooynta ama goynta, kormeerka.
● Miisaanka, baakaynta iyo calaamadaynta, iwm.) waxa lagu farsameeyaa taarikada birta ah, gariiradaha fidsan iyo alaabada birta jeexan.