The MMB Rotating Light Micro Mini-bars are 17.25" in width and include a polycarbonate outer dome and a powder painted steel base with rubber gasket. The MMBTR-X rotating light mini-bars feature two 55 watt XENON bulbs (2000 Hours) in a highly polished reflector for a very efficient and attention getting warning light. Replace the last "X" in the part # for the outer dome color required, A-amber, R-red, B-blue, C-clear.