Philips X-treme Vision H4 motorcycle bulbs are designed with cutting-edge technology. These bulbs contain an innovative gaseous compound that reduces filament deterioration and increases resistance, optimizing lamp life. In order to offer high performance and safety, Philips X-treme Vision H4 motorcycle bulbs are equipped with cutting-edge technologies to offer up to 130% more brightness to all motorcyclists who want to see further. They are made of high-quality quartz glass.