The Putco PURE H.I.D. bulbs (High - Intensity Discharge) are manufactured with the Highest Grade materials and most advanced technology in the automotive industry today, these HID light bulbs will dramatically improve your visibility at night as these bulbs will replace your old light decayed bulbs that are very likely manufactured with inferior components. These HID light bulbs feature an aluminum housing construction and a quartz glass tube filled with GE German Xenon gas these will out - perform cheaper options with similar claims. Be aware of fake, cheaper re - productions