Izihlungi zamafutha kanye nezihlungi zikawoyela (izihlungi zikawoyela wenjini) ziyizingxenye ezimbili ezihlukene zezimoto ezinokusetshenziswa okuhlukile okuyisisekelo. Izihlungi zikaphethiloli zihlunga ngokuyinhloko ukungcola kuphethiloli ukuze kuqinisekiswe ukuhlanzeka kukaphethiloli, ngokunemba okuvamile kokuhlunga phakathi kuka-1μm no-50μm, ukuthuthukisa ukusebenza kwenjini nokonga kukaphethiloli. Izihlungi zikawoyela, ngakolunye uhlangothi, zigxila ekuhlungeni uwoyela wenjini, ukususa izinsalela zensimbi nokunye ukungcola, ukuvikela izingxenye zenjini yangaphakathi. Kweminye imikhiqizo, izihlungi zikaphethiloli namafutha zingaba nezindawo ezihlukene zokufaka nezakhiwo kuye ngemodeli yemoto kanye nomklamo wenjini.
