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: please check existing bulb before placing order, if not sure please visit sylvania bulb reference guide, using Amazon partfinder will not guarantee fitment, 12V input required