This is the Prism version of the old style "Chopper Box light." It's equipped with a dual function LED cluster that acts as both a brake light and running light. The size of the Prism version housing is 4-1/4" long X 3/4" wide X 2-1/8" in height while the size of the original style is 4-1/4" long 2" wide and 2" in height. The wires exit through the back of the housing. The housing is made of aluminum which gives you the option for polish, chrome, powdercoat or just leave raw.