These new cold cathode fan grills offer a ring of bright cold cathode light. The ring has a diameter of 80mm. Installation of this cathode grill is simple, just screw it into the fan via the four mouting holes and installation is complete. The cathode is extremeley small, allowing your fan to fit nearly anywhere. The cathode is enclosed in thin crylic casing to provide protection for the lights. With an ultra long life span cold cathode fan grills are the perfect addition to any mod.