OPT7 35w Xenon HID Conversion Kit 08-11 GMC Sierra Denali - H11 5000K Pure White Ultra Bright Z-Arc Mini-ball" Xenon bulb: Produces a 5x brighter light then halogen, uses 35% less power, increases visibility, and made to last with a 5000-hour non-fading lifetime Blitz 35w Series Ballast: Super bright 3100 lumen performance, reduced flickering with non-cycling technology, long lasting stainless steel case, and Six-Sigma quality manufacture Easy to Use Plug-and Play with QuickSnap connectors. Can be installed on any compatible vehicle. Not all applicable vehicles are included in compatibility list, check Sylvania's website to ensure correct bulb size 100% Water, shock, and rumble resistance, Six-Sigma Quality Assurance Testing along with a 2 year manufacture's warranty guarantee's your product will stick around for the long run. Kit Includes: 2 OPT7 HID H11 5000K Pure White Xenon Bulbs 2 OPT7 Blitz 35w Standard Power Ballasts 2 Sets of Universal Mounting Brackets Complete Easy-to-Use installation instruction manual