Each bundle contain 2 bulbs, 2 ballast, and accessories
Xenon Bulb: 2 xenon bulb fits socket size and color described on the title
Ballast: 35w standard size electronic ballast for xenon bulb
Installation: pre-assembly maybe required before installation, professional installation recommended
Compatibility: commonly used for high beam, please check existing bulb before placing order or contact seller for matching info, if not sure please visit sylvania bulb reference guide, using Amazon partfinder will not guarantee fitment, 12V input required