SYLVANIA - 9004 (HB1) SilverStar zXe High Performance Halogen Headlight Bulb - Bright White Light Output, HID Attitude, Xenon Fueled Technology (Contains 2 Bulbs) LIGHTS DIM OVER TIME, REPLACE IN PAIRS: Your lights are a pair, one is never turned on without the other. If one bulb burns out, the other isn't far behind. Replace your 9004 SilverStar zXe bulbs in pairs for optimum performance. XENON CHARGED LIGHT BULBS: Cobalt blue coating provides optimal light transmission and color. Proprietary Xenon halogen gas technology. SLEEK STYLE MEETS PREMIUM PEFORMANCE: Silver mirror top alloy coating completes the jewel-like appearance of the headlights. These 9004 SilverStar zXe bulbs provide crisp, white light - the look, feel and attitude of HID. SUPERIOR HID ALTERNATIVE FOR MORE ATTITUDE: Proprietary Xenon halogen gas technology that makes these bulbs the best alternative and value compared to dropping in HID upgrades. DOT Compliant and 100% Street Legal. THE SYLVANIA STANDARD OF QUALITY: With 100+ years in business, Sylvania is the world leader in automotive lighting for Original Equipment Manufacturers (OEMs) and the aftermarket.