Each lamp measures 6"×3-1/2" and is rectangle shape featuring a ultra high intensity H-3, 100 Watt quartz halogen bulb. The body and reflector are steel and the lens is tempered glass. The housing and fastening ring is powdercoated black. Each lamp comes with a standard mounting bracket. 
Waterproof  - suitable for mounting in the grille of a vehicle or on the back deck. 
These lights will require a flasher to alternate flash (not included) A 537 type alternating flasher can be purchased at most auto parts stores.