Halo Automotive Premium 9004 10000K HID Xenon Conversion Kit Mid-Slim Ballasts Halo Automotive is a leading manufacturer of Japanese lighting products utilizing the latest in Japanese design and technology. Halo is committed to providing high quality lighting products combined with warranties that are among the best in the industry. So rest assured, with reliability that stands behind our products, your purchase is only the beginning of our commitment to you. Get Halo and "Get Enlightened!" Easy installation- usually in 10 minutes or less (some cars may need professional installation) Ballasts are 100% Water-resistant, 100% Dust-proof, 100% Shock-proof Included in kit: 2 mid-slim ballsts, 2 premium xenon bulbs, installation instructions Lo/Hi Halogen Bulb means the low beam is HID Xenon and the high beam is a regular halogen bulb. If you would like HID Xenon for high-beam also, you will need a Halo Automotive Premium Bi-Xenon Conversion Kit.