Jira risina kurukwa rakakodzera kusefa mafuta einjini rinowanzo shandisa zvinhu zvisingapindi mafuta zvakaita sepolyester (PET), ine huremu hwemagiramu 60-120 pa square mita, ukobvu hwe 0.3-0.8mm, uye saizi yeburi rema microns 10-30, kuti ienzanise kushanda zvakanaka kwekusefa uye kupindira kwemhepo.
Ruvara, kutaridzika uye zvinhu zvinogona kugadziriswa.
