"Hella Optilux XB xenon blue light bulbs, 9004 12V 100/80W. These bulbs are filled with xenon gas and utilize a blue quartz glass which allows the bulbs to simulate the color of actual daylight. Great assist when driving in rain or dark winter nights. Bulbs are sold in a set of two. Due to the high light output these bulbs ARE ONLY FOR OFF ROAD USE! Click HERE to view bulb application charts for your vehicle."