Housings are machined from 6061 T-6 billet aluminumThree-wire LED unit on each light includes 10 LEDs and measures 51/4'' L x 1/2'' W can be wired as run/turn/brake lightsApproximately 3/4'' of clearance is required behind the surface these are installed intoMade in the U.S.A.May require load equalizer or turn signal controller depending upon application.