Njengengxenye yokukhishwa kwamandla yesithumeli, i-pulley yokushayela ihlukaniswe yaba izinhlobo ezimbili: I-smooth surface kanye ne-rubber coated surface pulley.Ngaphansi kwesimo samandla aphansi kanye nezinga lokushisa elincane le-ambient, i-pulley ebusweni obushelelezi ingasetshenziswa.Endabeni yendawo enomswakama, amandla aphezulu kanye nokushelela kalula, kufanele kusetshenziswe i-pulley eboshwe ngenjoloba.